Full opinion text
POLITZ, Circuit Judge: In the decade following enactment of the Racketeer Influenced and Corrupt Organizations Act (RICO), 18 U.S.C. §§ 1961 et seq., prosecutions under that Act have begun to follow the recognizable patterns we noted in United States v. Malatesta, 583 F.2d 748 (5th Cir. 1978), aff’d on reh. on other grounds, 590 F.2d 1379 (5th Cir.) (en banc), cert. denied, 440 U.S. 962, 99 S.Ct. 1508, 59 L.Ed.2d 777 (1979). The cases are characterized by lengthy indictments involving multiple defendants charged with diverse criminal activity. In the style of that embryonic tradition this appeal presents sixteen defendants with a combined total of eighty convictions. The prosecutions we review were commenced by an eighty-three page, thirty-five count indictment, charging twenty-three defendants with mail fraud, RICO conspiracy and RICO substantive violations, specifying sixty-nine overt acts and fifty-six predicate acts of racketeering activity. Three defendants entered guilty pleas. The remaining twenty were jointly tried before a jury in a trial spanning three months. After deliberating three and one-half weeks, the jury found four defendants not guilty and sixteen defendants guilty of one or more counts; all appeal. The supplemented record on appeal includes 8 volumes of pleadings, nearly 100 volumes containing more than 11,000 pages of the testimony of over 200 witnesses, and 5 boxes of exhibits. The indictment resulted from an investigation of a large number of suspected acts of arson occurring in Tampa and Miami, Florida between July 1973 and April 1976. The indictment charges that a group composed of an insurance adjuster, homeowners, promoters, investors and arsonists associated for the purpose of committing arson with the intent to defraud fire insurers. This association of individuals is characterized as an “enterprise,” thus bringing the offenses within the purview of RICO, 18 U.S.C. § 1962. Count 1, of which the sixteen defendants were convicted, charges a conspiracy to violate RICO, § 1962(d). Count 2, of which fifteen defendants were convicted, charges a substantive violation of RICO, § 1962(c). Counts 3 through 35 charge various defendants with violations of the mail fraud statute, 18 U.S.C. § 1341, and aiding and abetting, 18 U.S.C. § 2, arising out of the filing of insurance claims and receipt of payments for the losses resulting from the arsons. Several issues are presented on appeal; some are common to all appellants, some to more than one, and some apply to only a particular appellant. Each appellant has filed a brief in which the arguments advanced by all other appellants are adopted. We shall, in general, address the common issues first and then review those issues pertinent to only a single appellant. I. The Setting — The Cast A summarization of the facts concerning each of the fifteen fires and subsequent insurance claims is set forth in the Appendix. We discuss these facts in somewhat greater detail during consideration of various contentions of insufficient evidence to support the convictions. An overview of the charged conspiracy and enterprise, however, facilitates an understanding of the application of RICO, particularly because, the degree of involvement varied with each defendant. The arson ring began operating in 1973 when Paul Guarino and Frank Scionti hired Willie Noriega as their principal “torch.” At first the arsonists only burned buildings already owned by those associated with the ring. Following a burning, the building owner filed an inflated proof of loss statement and collected the insurance proceeds from which his co-conspirators were paid. Later, ring members bought buildings suitable for burning, secured insurance in excess of value and, after a burning, made claims for the loss and divided the proceeds. Different roles were played by those defendants comprising the enterprise. Joseph J. Carter was the insurance adjuster who, with knowledge of the arson, processed fire loss claims. In return for this service and for guiding others to insurance agencies where fire insurance could be secured in excess of the value of substandard property, Carter received a portion of the insurance proceeds. He pled guilty to nineteen counts and testified as a government witness. Willie Noriega, the primary arsonist, pled guilty to all 35 counts and testified as the key government witness. Noriega was assisted in the “torching” by Paul Guarino, Frank Scionti, Joseph Macaluso and Victor Arrigo, who also testified as a government witness after pleading guilty to seven counts. Sam C. Martino and Berton B. Chase provided financing for some of those who bought property targeted to be burned. Martino was in the real estate business and, in addition to arranging loans, located substandard property for use in the scheme. The defendants who acquired or aided in the acquisition of targeted property, secured excessive insurance and collected insurance payments included Carter, Guarino, Martino, Noriega, Macaluso, Amalia Morgado, John D. Fisher and Robert D. Young. Several defendants already owned premises, mostly substandard, covered by fire insurance. They needed only the services of the arsonists and, in some instances, claims assistance. This group included Jimmy Farina, Joseph D. Lazzara, Rolando Gonzalez Rodriguez, Joseph C. Russello, John Alan Holt, Rosario Palermo and William H. Brown. Finally, there were those who served as the contacts or go-betweens for persons who owned property they wished to have burned, or who wanted to acquire property for that purpose, and the arsonists. These “marketers” or “brokers” included Carter, Guarino, Scionti, Morgado, Martino and John Nicholas Lostracco. With the basic structure of the “enterprise” and the roles of the various defendants in perspective, we now consider the assignments of error. A. Constitutionality of RICO The RICO statute is challenged on five grounds that, in the main, have been considered and dismissed in earlier cases. It is contended that RICO (1) punishes associational status, (2) does not apply to enterprises engaged solely in criminal activity, (3) is unconstitutionally vague, (4) operates ex post facto, and (5)- is contrary to the Ninth and Tenth Amendments. In United States v. Elliott, 571 F.2d 880 (5th Cir.), cert. denied, 439 U.S. 953, 99 S.Ct. 349, 58 L.Ed.2d 344 (1978), we rejected the argument that RICO unconstitutionally punishes associational status; “its proscriptions are directed against conduct, not status.” Id. at 903. Also in Elliott, and recently reaffirmed in United States v. Diecidue, 603 F.2d 535 (5th Cir. 1979), cert. denied, 445 U.S. 946, 446 U.S. 912, 100 S.Ct. 1345, 100 S.Ct. 1842, 63 L.Ed.2d 781, 64 L.Ed.2d 266 (1980), we held RICO applicable to a group whose sole purpose was to engage in illegal activities. Appellants request a reconsideration of that position in light of contrary opinions from other circuits. We are aware of the criticisms leveled at our decisions and we recognize that appellants’ position is arguably meritorious. What appellants request, however, is not a course available to this panel but is a prerogative only of our court sitting en banc. Appellants’ third contention, that RICO is unconstitutionally vague, was rejected in United States v. Hawes, 529 F.2d 472, 479 (5th Cir. 1976), in which we held that a person of average intelligence, upon reading the statute with the aid of relevant definitional provisions, “could not help but realize that they would be criminally liable for participating in ‘any enterprise,’ including their own, ‘through a pattern of racketeering activity.’ ” Whether RICO is unconstitutional as an ex post facto law because of judicial enlargement is a question never before considered by us. The defendants argue that by applying RICO to illegitimate as well as legitimate enterprises, we have deviated so far from an average person’s understanding of RICO that an ex post facto effect results. It is not every judicial expansion of statutory construction that creates an ex post facto law; rather, it is only those which are “unexpected and indefensible by reference to the law which had been expressed prior to the conduct in issue.” Bouie v. City of Columbia, 378 U.S. 347, 354, 84 S.Ct. 1697, 1703, 12 L.Ed.2d 894 (1964), quoting Hall, General Principles of Criminal Law at 61 (2d ed.1960). “Enterprise” is defined in § 1961 to include “any ... group of individuals associated in fact although not a legal entity.” This language is broad and non-restrictive. It is not unreasonable to suggest that this language encompasses groups associated for the purpose of committing arson with the intent to defraud. This general, non-specific language negates the contention that expansive judicial interpretation is either unexpected or indefensible. We do not find that the interpretation given to RICO by this court has so deviated from what would be an average person’s understanding that an ex post facto effect has occurred. This contention of constitutional abrogation is infirm. We likewise reject the proposition that RICO violates the Ninth and Tenth Amendments. Appellants assert that RICO intrudes upon state sovereignty because the statute fails to require that the acts of racketeering per se affect interstate commerce. This argument ignores the essence of RICO which proscribes the furthering of the enterprise, not the predicate acts. The predicate acts are, in turn, proscribed by existing, enumerated state or federal laws. United States v. Bright, 630 F.2d 804 (5th Cir. 1980). Appellants were not convicted of the state offense of arson; they were all (except Chase) convicted of the federal offenses of mail fraud and of conspiring to participate and participating in the affairs of an enterprise affecting interstate commerce. We conclude and hold that the five grounds upon which appellants challenge the constitutionality of RICO are without merit. B. The Indictment The indictment is challenged on several grounds, including insufficiency, duplicity and misapplication of RICO. It is also contended that there is a variance between the indictment and the evidence. First, it is argued that the required effect of interstate commerce is not sufficiently alleged. Like the indictment in Diecidue, supra, the instant indictment tracks the language of the statute as to the effect on interstate commerce. The indictment further charges that the defendants “did knowingly and willfully place and cause to be placed ... in authorized depositories for mail matter to be sent and delivered according to the directions thereon by the Postal Service of the United States.” The effect on interstate commerce is sufficiently. alleged. Appellants contend that Count 1 charges multiple conspiracies and therefore the indictment is duplicitous. Appellants insist that each fire listed constitutes a separate conspiracy. To the contrary, “[t]he allegations addressed to the various substantive offenses committed as part of the conspiracy are merely descriptive of the single overall agreement.” Diecidue, 603 F.2d at 546. The count is not duplicitous; it charges a single conspiracy involving several acts. It is next contended that the indictment is fatally defective because the appellants are charged under the wrong subsection of § 1962. It is argued that inasmuch as they are charged with associating with the other defendants, as the enterprise involved, they were mistakenly charged with violating subsection (c), rather than (b). This argument founders on the shoals of the language of RICO. Subsection (b) proscribes acquiring or maintaining an interest or control in an enterprise through a pattern of racketeering activity; subsection (c) makes it unlawful for one associated with or employed by the enterprise to participate in the conduct of its affairs through a pattern of racketeering activity. Appellants insist that § 1962(c) applies only to those who manage the enterprise, i. e., the top coterie. We disagree. Section 1962(c) makes it unlawful to “conduct or participate, directly or indirectly, in the conduct of such enterprise’s affairs.” The word “conduct” is neither illusive nor mysterious, nor is its use unique to RICO. It is found in other statutes including, inter alia, 18 U.S.C. § 1955 which makes it a crime for one to conduct an illegal gambling business. In United States v. Tucker, 638 F.2d 1292 (5th Cir. 1981), we held that a waitress serving drinks to customers engaged in gambling conducts an illegal gambling business within the intendment of 18 U.S.C. § 1955. We concluded in Tucker that the word “conducts” simply means the performance of activities necessary or helpful to the operation of the enterprise. Finally, appellants cite Kotteakos v. United States, 328 U.S. 750, 66 S.Ct. 1239, 90 L.Ed. 1557 (1946), attacking the indictment on the ground that it alleges only one conspiracy while the government’s evidence establishes multiple conspiracies. They contend that this results in a variance that substantially prejudiced their rights contrary to Kotteakos. We disagree. This argument has been considered in Elliott, Diecidue, and Bright, supra, and in United States v. L’Hoste, 609 F.2d 796 (5th Cir.), cert. denied,-U.S.-, 101 S.Ct. 104, 66 L.Ed.2d 39 (1980). In L’Hoste we resolved this issue adverse to the appellants, stating: “If the Government proves multiple conspiracies and a defendant’s involvement in at least one of them, then clearly there is no variance affecting that defendant’s substantial rights.” 609 F.2d at 801, citing United States v. Wayman, 510 F.2d 1020 (5th Cir.), cert. denied, 423 U.S. 846, 96 S.Ct. 84, 46 L.Ed.2d 67 (1975). Following the path of L’Hoste, we find no variance affecting the appellants’ substantial rights. We find no merit in any of appellants’ challenges to the indictment. C. Double Jeopardy Appellants submit that the government should have been forced to elect between Counts 1 and 2 because prosecution on both does violence to the double jeopardy clause which “protects against multiple punishments for the same offense.” United States v. Smith, 574 F.2d 308, 309 (5th Cir.), cert. denied, 439 U.S. 931, 99 S.Ct. 321, 58 L.Ed.2d 325 (1978), quoting North Carolina v. Pearce, 395 U.S. 711, 717, 89 S.Ct. 2072, 2076, 23 L.Ed.2d 656 (1969). The “same offense” test may be simply stated: If there is any difference in the elements to be proven, the two instances are not the same offense. Blockburger v. United States, 284 U.S. 299, 52 S.Ct. 180, 76 L.Ed. 306 (1932). Application of the rubric to RICO violations requires pause and reflection because of the nature of the RICO statute. We bear in mind that under Blockburger we must determine if one offense requires proof of a fact not required by the other. Prosecution of RICO substantive and conspiracy charges expectedly involves considerable overlap in the evidence, especially where the enterprise exists as a consequence of persons associating and committing acts making up a pattern of racketeering activity. Such overlap does not occasion an automatic invocation of double jeopardy. Iannelli v. United States, 420 U.S. 770, 95 S.Ct. 1284, 43 L.Ed.2d 616 (1975). A RICO substantive charge requires proof of the existence of an enterprise which affects interstate commerce and that the defendant participated in the conduct of the enterprise’s affairs by committing at least two of the designated acts of racketeering activity. A RICO conspiracy charge requires the additional element of agreement; the defendant must have “objectively manifested an agreement to participate, directly or indirectly, in the affairs of an enterprise through the commission of two or more predicate crimes.” Elliott, 571 F.2d at 903 (emphasis in original). The Elliott court also stated that the agreement involved in a RICO conspiracy must include the vital element of agreeing to commit the predicate acts. Upon proof of the commission of racketeering activity, “the inference of an agreement to do so is unmistakable.” Id. This statement has been interpreted to cast a shadow across the sun because it leads to the argument that the distinguishing element of subsection (d) (the agreement to violate) evaporates because proof of the substantive charge automatically includes proof of a conspiracy. United States v. Anderson, 626 F.2d 1358, 1368-69 n. 18 (8th Cir. 1980); Note, Racketeers, Congress and the Courts: An Analysis of RICO, 65 Iowa L.Rev. 837, 879 (1980). If the only evidence offered from which a jury can infer an agreement to participate in the enterprise is evidence of engaging in a pattern of racketeering activity, the requisites for applying the double jeopardy rule would appear to exist. Albeit persuasive, this argument glosses over the essential teaching of Block-burger and obfuscates the inquiry whether the two counts charge the same offense. The aegis of the double jeopardy clause of the Fifth Amendment is not invoked merely by showing that a jury had the opportunity to convict on two counts by drawing appropriate inferences from the same evidence. “[T]he Blockburger test looks not to the evidence adduced at trial but focuses on the elements of the offense charged.” United States v. Cowart, 595 F.2d 1023, 1029 (5th Cir. 1979). That the distinguishing element can be proven by the same evidence as that used to convict on another count does not bring the offenses within the context of double jeopardy. United States v. Dunbar, 591 F.2d 1190 (5th Cir. 1979), aff’d on reh. on other grounds, 611 F.2d 985 (5th Cir. 1980) (en banc). The RICO substantive and RICO conspiracy convictions are not vitiated by the double jeopardy clause. D. Pre-trial Matters Appellants request our review of certain pre-trial matters they contend constitute reversible error. These include motions for bill of particulars, requests for Brady material and the medical examination into Willie Noriega’s competence to testify. It is argued that because of the complexity of the case, the motions for bill of particulars should have been granted to prevent confusion which hindered the defendants from understanding the nature of the charges against them. Action on a motion for bill of particulars is committed to the sound discretion of the trial judge. We may reverse a ruling denying the motion only if a defendant demonstrates that he was “actually surprised at trial and thus incurred prejudice to his substantial rights by the denial.” Diecidue, 603 F.2d at 563. No such demonstration has been made to this court; there has been no abuse of discretion and no reversible error exists. Appellants contend that the government failed to comply with the disclosure requirements of Brady v. Maryland, 373 U.S. 83, 83 S.Ct. 1194, 10 L.Ed.2d 215 (1963), and its progeny. They specifically call our attention to inconsistent statements made prior to and during trial by a government witness and a letter sent to the U.S. Attorney by a psychiatric expert for the government. The alleged inconsistent statements were made by a witness with respect to a 1972 fire in which two arsonists died. In her first statement to the police shortly after the fire, the witness said that Robert Brad-well (one of the arsonists who died) had told her that he had been robbed and set on fire by unknown persons. At trial, she testified that Bradwell had asked her to make that statement, but that he also told her what really happened: he had been burned while he, Lester Oates and Paul Guarino set fire to the Kakeland Bakery. As impeaching evidence, the pri- or inconsistent statement would fall within disclosure requirements because Brady encompasses impeachment evidence as well as evidence favorable to the accused on the issue of guilt. United States v. Auten, 632 F.2d 478 (5th Cir. 1980). Failure of the government to disclose information useful only for impeachment, however, mandates reversal only if defendants demonstrate that the undisclosed evidence probably would have resulted in acquittal. United States v. Anderson, 574 F.2d 1347 (5th Cir. 1978). It cannot be seriously contended that this one statement made by one of the more than one hundred government witnesses would probably have resulted in acquittal. The claim is devoid of merit. The remaining asserted Brady violation concerns a letter written to the U.S. Attorney by the psychiatrist who served as the government’s witness on rebuttal. In the letter the psychiatrist opined that Willie Noriega was not psychotic in 1963 but that he had self-induced psychotic symptoms by using drugs in an attempt to avoid prosecution for arson. The letter was given to the defendants after the doctor testified, consistent with the requirements of the Jencks Act, 18 U.S.C. § 3500. This disclosure expunged any earlier error because “when alleged Brady material is contained in Jencks Act material, disclosure is generally timely if the government complies with the Jencks Act.” Anderson, 574 F.2d at 1352. This Brady claim is also without merit. Pursuant to a defense request prior to trial, the trial court exercised its discretion and appointed an expert to conduct a competency examination of Noriega. See United States v. Roach, 590 F.2d 181 (5th Cir. 1979); United States v. Jackson, 576 F.2d 46 (5th Cir. 1978). The psychiatrist was instructed to examine Noriega and formulate an opinion about his present mental state and whether he was then able to differentiate reality from fantasy and accurately to remember and relate events that occurred during the prior five years. The expert determined Noriega was competent to testify at trial. Appellants insist the court erred in not requiring the psychiatrist also to determine Noriega’s mental condition during the time period of the alleged offenses. Whether a witness is competent to testify is a threshold question of law to be answered by the judge. Roach, supra; Wharton’s Criminal Evidence, Vol. 11 § 377 (13th ed. C. Torcía 1972). It is left to the jury to assess a witness’s credibility and the weight to be accorded his testimony. Because a witness’s mental state during the period about which he proposes to testify is a matter which affects his credibility, it is a jury determination and thus not germane to competency to testify. We posted this trail in United States v. Partin, 493 F.2d 750, 762 (5th Cir. 1974), cert. denied, 434 U.S. 903, 98 S.Ct. 298, 54 L.Ed.2d 189 (1977): The readily apparent principle is that the jury should, within reason, be informed of all the matters affecting a witness’s credibility to aid in their determination of the truth .... It is just as reasonable that a jury be informed of a witness’s mental incapacity at a time about which he proposes to testify as it would be for the jury to know that he then suffered an impairment of sight or hearing. It all goes to the ability to comprehend, know, and correctly relate the truth. See also Greene v. Wainwrlght, 634 F.2d 272 (5th Cir. 1981). In the case at bar the trial judge was not obligated to ask the court-appointed expert to determine Noriega’s mental capacity at the time of the alleged offenses as well as his competence to testify. It would not have been error had the trial judge done so, for this would have been an additional item of evidence for the jury to consider in making its credibility assessment. Nevertheless, to decline to grant this defense request does not constitute reversible error. The defendants had ample opportunity to show Noriega’s mental condition at the time about which he testified. Defense experts testified, as did acquaintances of Noriega who knew him during the arson spree. Furthermore, the jury was properly instructed to consider evidence of a witness’s mental condition at the time of the incidents in judging the credibility of the witness and the weight to be given to that witness’s testimony. E. Joint Trial versus Severance Each appellant alleges prejudice by the joinder of his trial with the other defendants and that the trial judge committed reversible error in failing to grant the repeated motions for severance. Joinder was proper under Rule 8(b), Fed.R.Crim.P. See Bright, supra. Accordingly, defendants must rely on Rule 14, Fed.R.Crim.P., which permits severance if a defendant is prejudiced by the joinder. On a Rule 14 severance motion, the trial judge is required to weigh the prejudice inherent in a joint trial in light of the realities of judicial economy and to sever defendants as the needs of justice dictate. United States v. McLaurin, 557 F.2d 1064 (5th Cir. 1977), cert. denied, 434 U.S. 1020, 98 S.Ct. 743, 54 L.Ed.2d 767 (1978). The denial of a motion to sever is reversible only for abuse of discretion. An appellant’s burden of showing prejudice is onerous; the general test is: whether under all the circumstances of the particular case, as a practical matter, it is within the capacity of the jurors to follow the court’s admonitory instructions and accordingly to collate and appraise the independent evidence against each defendant solely upon that defendant’s own acts, statements and conduct. In sum, can the jury keep separate the evidence that is relevant to each defendant and render a fair and impartial verdict as to him? If so, though the task be difficult, severance should not be granted. Peterson v. United States, 344 F.2d 419, 422 (5th Cir. 1965). To buttress their claim of prejudice, appellants submit an impressive litany: there were twenty defendants, most with Spanish or Italian surnames; thirty-five counts (only thirty-three remained after Noriega pled guilty) were charged, but many of the defendants were charged in only a few of the counts; the trial lasted three months; the jury heard over 200 witnesses, some testifying against many defendants, others testifying against only a few; and there were nineteen defense counsel and three prosecuting attorneys, all within the confines of a modest sized courtroom. Appellants argue that the totality of these facts created a “circus” atmosphere rather than that which should prevail for a serious criminal trial. We are keenly aware that joint trials, especially those involving numerous defendants and multiple charges, carry substantial risks of manifest unfairness. We do not encourage trials en masse. We must, however, reckon with the realities of this type prosecution. The Constitution does not guarantee a trial free from the burdens that inevitably accompany such a trial; rather, it requires that the potential for transferability of guilt be minimized to the extent possible in order to “individualize each defendant in his relation to the mass.” Kotteakos, supra; United States v. LeCompte, 599 F.2d 81 (5th Cir. 1979), cert. denied, 445 U.S. 927, 100 S.Ct. 1313, 63 L.Ed.2d 759 (1980); Eiliott, supra. We recently confronted this same issue in United States v. Morrow, 537 F.2d 120, 136 (5th Cir. 1976), cert. denied, 430 U.S. 956, 97 S.Ct. 1602, 51 L.Ed.2d 806 (1977), and our discussion relative to severance is appropriate here: In reviewing a claim of undue complexity and confusion, an appellate court looks to the totality of the circumstances in striking a balance between the interest in judicial economy and the need to protect the rights of the individual defendant. A joint trial of twenty-three defendants, charged with conspiracy and numerous substantive counts, clearly raised the possibility that the jury might cumulate the evidence introduced by the Government on all counts and against all defendants to find guilty a defendant whose connection with the conspiracy was at best marginal. The pernicious effect of cumulation, however, is best avoided by precise instructions to the jury on the admissibility and proper uses of the evidence introduced by the Government. The remedy of severance is justified only if the prejudice flowing from a joint trial is clearly beyond the curative powers of a cautionary instruction. Where the Government charges a single conspiracy, as it did here, much of the evidence introduced ultimately bears, at least indirectly, on the agreement of the co-conspirators. Once the Government has satisfactorily established the existence of the conspiracy, the same evidence used to convict a particular defendant is admissible against all co-defendants shown to be members of the conspiracy. Given this state of affairs, the interest in judicial economy understandably exerts strong pressures in favor of a joint trial. In the case sub judice Judge Hodges faced a formidable task. He conducted the trial with great skill and with a judicial professionalism much to be admired. He minimized the potential transference of guilt with every tool at his command. He gave careful, detailed instructions about the elements of RICO conspiracy and RICO substantive charges, doing so, as appropriate, as they related to each defendant. Proper uses of evidence were explained. Judge Hodges met the burden of avoiding the “pernicious effect of cumulation.” Notwithstanding the very skillful presiding of the trial judge, appellants argue'that the totality of the circumstances were such that a jury had to be confused and unable to individualize the verdicts simply because of the volume of evidence which inundated them. We acknowledge the validity of this concern and, were it not for the manner in which Judge Hodges handled this obviously difficult trial and our review of the verdicts in light of the record, we might be prone to agree with appellants. We finally resolve this contention by “look[ing] to the verdict. Convictions will invariably be sustained if it may be inferred from the verdict that the jury ‘meticulously sifted the evidence’ as where it acquits on certain counts.” Tillman v. United States, 406 F.2d 930, 936 (5th Cir.), vacated in part on other grounds, 395 U.S. 830, 89 S.Ct. 2143, 23 L.Ed.2d 742 (1969), quoting 8 Moore, Federal Practice ¶ 14.04[1], at 14-15 (2d ed. 1968). It is apparent from the verdicts reached that the jury, after more than three weeks of deliberation, did “meticulously sift” the evidence. Four defendants were acquitted on all charges; eight others were convicted on some charges but acquitted on others. Although coming close, defendants have not met the burden imposed to compel our finding of an abuse of discretion. F. Trial Errors Appellants allege reversible error because of prosecutorial misconduct, misconduct of defense counsel and various other trial errors. They maintain that whereas the alleged errors singularly might not be sufficient to mandate reversals, their cumulative effect denied appellants a fair trial, warranting reversals of the convictions. After examining each error assigned, we are compelled to disagree. 1. Jencks Act Appellants condemn the manner in which the government conducted interviews with its witnesses ostensibly to avoid producing Jencks Act material under 18 U.S.C. § 3500, calling it “the most abusive conduct by the government.” It became evident during trial that government attorneys and FBI agents held several interviews with potential witnesses but no written or recorded statements were taken. Appellants argue that the government purposely failed to record the interviews because they wanted to hinder the defense and that such tactics by the prosecution should not be tolerated. No requirement has been brought to our attention that all interviews must be recorded or that interview notes must be reduced to writing and signed or otherwise approved by the witness. We cannot presume that the prosecutor acted in bad faith by failing to reduce his notes to statement form. That interviewers usually take notes rather than verbatim statements was noted by Justice Powell in his concurrence in Goldberg v. United States, 425 U.S. 94, 122 n.9, 96 S.Ct. 1338, 1345 n.9, 47 L.Ed.2d 603 (1976), wherein he stated: Indeed, only the foolish or exceptionally talented counsel will depend solely on his memory when preparing for the examination of a key witness. But the fact that counsel usually will take notes does not mean that the notes often will be “statements.” Counsel rarely take down verbatim what witnesses say in these preparatory conferences. Consequently, prosecutors’ notes, may be expected to meet the requirements of [18 U.S.C. § 3500](e)(2) very infrequently. (Citations omitted.) The notes taken will vary from cryptic “memory jogs” to full summaries of the anticipated testimony. Appellants’ claim of error on this issue is without merit. 2. Opening Statements Comments made during opening statements by two of the twenty-two lawyers involved in this trial have been singled out and categorized as highly prejudicial and sufficient to warrant reversal. One statement is attributed to the prosecutor who informed the jury that Noriega and his family had been relocated to a different part of the country as a result of his cooperation with the government and that Noriega had received approximately $34,000 from the government. Defendants contend this was an improper reference to the federal Witness Protection Program and was a suggestion to the jury that the defendants were a source of danger to Noriega. Reference to a witness’s participation in the Witness Protection Program was also at issue in the appeal after remand in United States v. Partin, 552 F.2d 621 (5th Cir.), cert. denied, 434 U.S. 903, 98 S.Ct. 298, 54 L.Ed.2d 189 (1977). In Partin we recognized that disclosure of such participation is a delicate matter because the jury might infer that the defendant is a threat to the witness or his family. We made clear that the prosecution may not exploit the possibility of such an inference. At the same time, however, we recognized that the defendant should be permitted to show that a witness, while in the program, received substantial benefits. Such information is relevant in the ultimate determination of the witness’s credibility. Anticipating that Noriega’s receipt of benefits from the government would be used to impeach his credibility, the prosecutor chose to inform the jury of this in his opening statement. This information is admissible and we cannot say that the prosecutor’s brief comment at the beginning of trial was an unfair exploitation. The remaining comment during opening statements to which defendants assign error was made by counsel for co-defendant Lostracco who commented that his client, presented as entirely innocent of the charges brought against him, was forced as a result of the indictment to sit down with a “bunch of gangsters.” Defendants argue that this comment was highly prejudicial, especially in light of the surnames of most of the defendants. While we do not condone such tactics or language by any counsel in any stage of a trial, we are not persuaded that it was so prejudicial as to mandate reversals. The statement in question was made at the beginning of a lengthy trial and was not repeated. After viewing the entire record, we are not convinced that the improper statement influenced the jury at all. We find the error harmless. 3. Defense Counsel’s Comment on His Client’s Decision to Testify Counsel for Lostracco is the subject of another assignment of error. In closing argument, he made repeated references to Lostracco’s testimony, emphasizing that his client had chosen to testify. The other defendants contend that this was an improper reference to their decisions not to testify, thus causing reversible error. This argument was raised and rejected in Diecidue, supra, wherein we noted that while references to an accused’s silence is reversible error, “mere favorable observation on the willingness of one of several co-defendants to testify” is not reversible error. 603 F.2d at 553. This assignment is without merit. 4. Assertion of Fifth Amendment Privilege Another argument raised by appellants was similarly rejected in Diecidue, a case in which Willie Noriega also testified as a government witness. In both trials, Noriega chose to exercise his Fifth Amendment right against self-incrimination. In both appeals the defendants have argued that Noriega’s decision to exercise his Fifth Amendment right denied them the right of confrontation. The questions which prompted assertion of the Fifth Amendment privilege were almost identical in both proceedings. In Diecidue we noted that where a witness legitimately invokes the privilege, the testimony is to be struck only if the defendants’ resultant inability to complete their questioning creates a substantial risk of prejudice. Generally, it is only when a witness refuses to answer questions on direct, as opposed to collateral issues, that his testimony is excised. The questions asked of Noriega were aimed at undermining his credibility. His credibility had already been the subject of intense attack during cross-examination. Therefore, as in Diecidue, “the responses illicited by defendants’ questions would have been mere cumulative evidence of credibility.” 603 F.2d at 552. The trial judge’s refusal to strike the responses was not erroneous. This same rationale applies to defendants’ argument relating to witness Joseph Carter’s decision to invoke his Fifth Amendment privilege. 5. Noriega’s Competence to Testify Noriega’s competence to testify has been attacked by several defendants who contend that Noriega was incompetent and that his testimony was incredible as a matter of law. As discussed earlier, whether a witness is competent to testify is a question of law for the trial judge. Unless an abuse of discretion is demonstrated, the trial judge’s decision will not be disturbed. United States v. Killian, 524 F.2d 1268 (5th Cir. 1975), cert. denied, 425 U.S. 935, 96 S.Ct. 1667, 48 L.Ed.2d 177 (1976). No such demonstration has been made. 6. Admissibility of Plea Agreement Appellants object to the introduction into evidence of Noriega’s plea agreement. Complaints are specifically made with reference to portions of the plea agreement that mention needed protection for Noriega and his family and his promise to testify “truthfully.” Appellants concede that they cross-examined Noriega extensively about his plea agreement; nevertheless, they allege that the areas of the agreement to which they object were not covered in their cross-examination. The possibility that the jury would infer that the defendants were the source of danger to Noriega was eliminated by the trial judge’s comments to the jury that the source of the threat was not the defendants in the instant case, but rather the defendants in another case in which Noriega had testified. As relates to the issue of the threat, it was not error to allow the jury to view the agreement between Noriega and the government. Nor did the plea agreement constitute an impermissible affirmation or bolstering by the prosecutor of the credibility of a government witness. The statement in the plea agreement that Noriega promised to testify “truthfully” does not constitute error-laden vouching for the credibility of a government witness. United States v. Arroyo-Angulo, 580 F.2d 1137 (2d Cir.), cert. denied, 439 U.S. 913, 99 S.Ct. 285, 58 L.Ed.2d 260, and 439 U.S. 1005, 99 S.Ct. 618, 58 L.Ed.2d 681 (1978), and 439 U.S. 1131, 99 S.Ct. 1052, 59 L.Ed.2d 93 (1979); United States v. Isaacs, 493 F.2d 1124 (7th Cir. 1974). As we stated in United States v. Rosson, 441 F.2d 242, 244 (5th Cir. 1971): “If the defense relies upon the existence of the plea bargain to attack the credibility of the witness, it is not then entitled to preclude the jury from being apprised of additional matters relevant to the bargain so as to leave an incorrect inference that the witness has made a better bargain for himself .. . than in fact he has made.” The court properly admitted the plea bargain agreement into evidence; appellants’ arguments to the contrary are rejected. 7. References to Polygraph Tests During cross-examination, Noriega made reference to his willingness to take a lie detector test. The defendants argue that the comment was so prejudicial that a mistrial should have been granted. It is currently the law in this circuit that the results of a polygraph test are inadmissible in evidence. United States v. Clark, 598 F.2d 994 (5th Cir. 1979). Because the jury is not allowed to know the results of the test, appellants insist that to permit a witness to testify concerning his willingness to take the test constitutes improper bolstering. Although we agree that Noriega’s response to the question was improper, we do not agree that it was prejudicial to the point of measurably affecting the jury’s verdicts. The trial judge not only cautioned the jury twice to disregard Noriega’s comment, he also told them why such an instruction was being given. He explained that polygraph tests have not yet achieved sufficient scientific reliability to be admissible in evidence. If there was any prejudice to the defendants, such prejudice was cured by the careful manner in which the trial judge handled the situation. 8. Comment on Defendants’ Failure to Testify Appellants suggest that an exchange that occurred after Noriega’s response as set forth in footnote 13, was grounds for a mistrial. They claim that the prosecutor made an improper reference to the decision of some of the defendants not to testify. That reference ostensibly occurred during the following exchange: THE COURT: Well, I will instruct the jury to altogether disregard that last part of the witness’s answer. MR. COHEN: Judge, I would like to be heard on that outside the presence of the jury. I think— THE COURT: Well, you may. MR. COHEN: I think that my client will be more than willing to enter that sort of stipulation. MR. HOGUE: (The Prosecutor) Objection to counsel testifying. If he wants to take the stand he may. At this point the judge excused the jury and held a discussion with counsel. The comment by the prosecutor that “If he wants to take the stand he may,” immediately followed the prosecutor’s objection to defense counsel testifying. It strains credulity to believe that the prosecutor was referring to a defendant. To accept the appellants’ argument we would have to view that statement out of the context in which it was said, a clearly impermissible approach. See United States v. Austin, 585 F.2d 1271 (5th Cir. 1978). Furthermore, the statement was not of “such a character that the jury would naturally and necessarily take it to be a comment on the failure of the accused to testify.” United States v. White, 444 F.2d 1274, 1278 (5th Cir.), cert. denied, 404 U.S. 949, 92 S.Ct. 300, 30 L.Ed.2d 266 (1971). It was not a reversible error reference to the defendants’ election not to testify. 9. Miscellaneous Improper Comments Various responses given by witnesses during the trial are challenged as being so prejudicial that they denied the defendants a fair trial. Our review of the record leads to the conclusion that these responses did not result in prejudice to the defendants. In reaching this conclusion we follow the guidelines expressed in United States v. Hyde, 448 F.2d 815, 847 (5th Cir. 1971), cert. denied, 404 U.S. 1058, 92 S.Ct. 736, 30 L.Ed.2d 745 (1972): “Allegedly improper statements should not be viewed in the abstract. The question is what impact they had in the context of the particular trial in terms of their relevance and the quantity of untainted evidence in the case.” As we noted earlier, this trial lasted over three months and the record includes more than 11,000 pages of testimony. We cannot say that the four or five responses complained of by the defendants measureably affected the jury in any way. This complaint is likewise without merit. 10. Exclusion of Hearsay Testimony Lazzara argues that certain hearsay testimony was wrongfully stricken from the record, resulting in prejudicial and reversible error. We do not agree. The hearsay testimony was elicited from witness Ruth McElroy, the mother of Hiram McElroy who was working for Lazzara at a Miami laundromat when it burned. Noriega testified that, as part of the scheme, he took Hiram McElroy to the bus station in Miami and then returned to the laundromat to set the fire. Noriega admitted responsibility for the fire, saying he set it at Lazzara’s request. Hiram McElroy, on the other hand, allegedly told his mother that he was sleeping in the laundromat when the fire broke out and that earlier he had been cooking on a hot plate and may have left it on. McElroy died prior to trial and Lazzara tried to get his statement into evidence as an exception to the hearsay rule under Rule 804(b)(3), Fed.R.Evid. The trial judge ruled the testimony was inadmissible hearsay. Rule 804 provides in part: (a) Definition of unavailability. — ‘Unavailability as a witness’ includes situations in which the declarant— ****** (4) is unable to be present or to testify .. . because of death .... (b) Hearsay exceptions. — The following are not excluded by the hearsay rule if the declarant is unavailable as a witness: ****** (3) Statement against interest. — A statement which ... at the time of its making ... so far tended to subject him to civil ... liability ... that a reasonable man in his position would not have made the statement unless he believed it to be true. In relying on this hearsay exception rule, Lazzara argues that McElroy subjected himself to civil liability by admitting possible fault in the laundromat fire. We find no error in the judge’s decision to strike the hearsay testimony. As reflected by the specific language used in Rule 804(b)(3), the statement against interest must be almost a direct, outright statement that the person was legally at fault. McElroy’s statement simply indicated that he might have been the one who caused the fire. There was testimony from fire inspectors that a hot plate was involved but that the fire was the result of arson. We agree with the trial judge that McElroy’s statement was not a declaration sufficiently subjecting him to civil liability to invoke the quoted exception to the hearsay rule. 11. Sequestration Breaks Appellants complain that once the trial judge chose to sequester the jury, it was error for him then to allow breaks in that sequestration by permitting the jurors to visit with family members without repeatedly reinstructing them about avoiding outside influence. Before a reversal will lie on this ground, appellants “must demonstrate a substantial likelihood that some prejudice did result.” United States v. Harris, 458 F.2d 670, 675 (5th Cir.), cert. denied, 409 U.S. 888, 93 S.Ct. 195, 34 L.Ed.2d 145 (1972). The trial judge has the discretion to decide whether to disperse the jury. Tyler v. United States, 397 F.2d 565 (5th Cir. 1968), cert. denied, 394 U.S. 917, 89 S.Ct. 1187, 22 L.Ed.2d 450 (1969). In the cases dealing with breaks in sequestration, emphasis is usually placed upon the fact that the judge reminded the jury to avoid outside influence. United States v. Banks, 485 F.2d 545 (5th Cir. 1973), cert. denied, 416 U.S. 987, 94 S.Ct. 2391, 40 L.Ed.2d 764 (1974); Tyler, supra. In the instant case, while the jury was not reinstructed prior to every break in sequestration, they were constantly reminded during the course of the trial (at which time they were not under order of sequestration) not to discuss the case with anyone and to avoid reading any publicity concerning the trial. While sequestered, and pursuant to the judge’s orders, the U.S. Marshals (in whom custody of jurors is entrusted) repeatedly reminded the jurors to refrain from discussing the case. Newspapers brought in by family members were edited before being given to the jurors. There can be no doubt that the jurors were fully aware of their responsibilities. The jurors deliberated for weeks; their sequestration spanned three weekends. We see no error in the judge allowing jurors to visit with their families at the hotel on Sundays. In light of the precautions taken by the judge during the trial, and through the marshals during deliberations, we see no basis for the contention that the defendants were prejudiced by the judge’s failure to reinstruct the jurors personally or to voir dire each one concerning possible exposure after the visitation periods. The allowance of family visits was a reasonable, humane and understanding act by the trial judge. No reversible error lurks within. 12. Miscellany Finally, Russello urges three other assignments of error: a biased grand jury, exclusion of evidence about Noriega’s character and an improper jury charge, a. Grand Jury Bias Russello contends he was deprived of his right to an unbiased grand jury because of two incidents. First, he complains that the prosecutor should not have called him to testify before the grand jury because after he received his subpoena, his attorney advised the prosecutor that Russello intended to exercise his Fifth Amendment privilege. Russello was nevertheless called as a witness; he exercised his Fifth Amendment privilege. It has long been recognized that “[c]itizens generally are not constitutionally immune from grand jury subpoenas.” Branzburg v. Hayes, 408 U.S. 665, 682, 92 S.Ct. 2646, 2657, 33 L.Ed.2d 626 (1972). Our courts have repeatedly reaffirmed “the historically grounded obligation of every person to appear and give his evidence before the Grand Jury.” United States v. Dionisio, 410 U.S. 1, 9, 93 S.Ct. 764, 769, 35 L.Ed.2d 67 (1973). “The personal sacrifice involved is a part of the necessary contribution of the individual to the welfare of the public.” Blair v. United States, 250 U.S. 273, 281, 39 S.Ct. 468, 471, 63 L.Ed. 979 (1919). Russel-lo’s claim that he should not have been called after revealing his intention to remain silent is without merit. Russello also alleges that after his appearance before the grand jury, he learned that the prosecutor, in the presence of the grand jury, told Farina that he, Farina, was a disgrace for exercising his right to remain silent. Russello argues that this was also a reflection on his right to remain silent. He points to no specifics to show that the jury imputed to him the prosecutor’s comment and attitude toward Farina. We do not agree that the prosecutor’s comment about Farina was an attack on Russello’s character. Russello was not denied the right to an unbiased grand jury. b. Exclusion of Evidence The thrust of Russello’s second contention is that he and his family were threatened by Noriega, that his building had been burned without his knowledge and that he had paid Noriega only because Noriega extorted the money. To support the argument that Noriega was a violent man, and to rebut inferences from government testimony to the contrary, Russello called a witness who was to testify about shooting Noriega after Noriega threatened the witness’s employer. The trial judge ruled the evidence inadmissible under Fed.R.Evid. 608(b). Russello relies on United States v. Opager, 589 F.2d 799 (5th Cir. 1979), where the trial judge excluded certain business records which would have shown that one of the government’s key witnesses was lying about a fact material to Opager’s defense. In response to Opager’s defense of entrapment, the government witness testified, in an effort to show the defendant’s predisposition to commit the crime, that he had worked with the defendant and had seen her engage in the same criminal conduct. The business records Opager sought to introduce would have established that she and the witness had not worked together at the pertinent time. In reversing the conviction, we emphasized that the evidence did not merely go to the witness’s character for truthfulness, but rather was relevant specifically to contradict the witness’s testimony as to a material issue. Opager is distinguishable from the situation in the case at bar. Although Russello relied on the defense that he acted in response to threats from Noriega, Noriega’s threats against the employer of the witness called by Russello did not relate directly to Russello as the excluded testimony in Opager related directly to the defendant. The material issue here was not whether Noriega had threatened the witness’s employer, but whether Noriega had threatened Russello. The evidence was not relevant to a “material issue” within the context of Opager. We find no error in the exclusion of this testimony. c. Jury Instruction Russello contends that the trial judge did not correctly charge the jury as to the evidence required for a mail fraud conviction. The challenged portion of the jury charge states: “A statement or representation may also be ‘false’ or ‘fraudulent’ when it constitutes a half-truth, or effectively conceals a material fact, with intent to defraud.” Russello relies on United States v. Meadows, 598 F.2d 984 (5th Cir. 1979), in which we held that a similar instruction created reversible error. There is one dis-positive difference between the charge in Meadows and the charge sub judice. The trial judge in Meadows stated that “under the law fraud may result from statements of half-truths or the concealment of material facts.” Id. at 987. The statement that created reversible error resulted from the failure by the court to remind the jury of the intent required to convict. In the instant case the trial judge added four critical words to the instruction that had been found wanting in Meadows; the instruction complained of here concludes with the words “with intent to defraud.” That phrase takes this instruction out of the Meadows category and compels our rejection of this claim. G. Sufficiency of the Evidence Most of the appellants challenge the sufficiency of the evidence to support their convictions on both the RICO and the mail fraud charges. We recently reiterated the standard for review of such a challenge in United States v. Marx, 635 F.2d 436, 438 (5th Cir. 1981): In reviewing the sufficiency of the evidence, we must view all the evidence, direct and circumstantial, in the light most favorable to the government, and must accept all reasonable inferences and credibility choices that tend to support the jury’s verdict. (Citations omitted.) The standard of review is whether a jury could reasonably find that the evidence was inconsistent with every reasonable hypothesis of innocence or, put another way, whether a reasonably minded jury must necessarily entertain a reasonable doubt of the defendant’s guilt. With respect to the conspiracy convictions, the test on appeal is whether there is substantial evidence to support the verdicts. Id.; United States v. Malatesta, 590 F.2d 1379 (5th Cir.) (en banc), cert. denied, 440 U.S. 962, 99 S.Ct. 1508, 59 L.Ed.2d 777 (1979). We shall review the RICO convictions separate from the mail fraud convictions because of the obvious difference in the evidence required to sustain convictions. 1. RICO Convictions Five necessary elements comprise a substantive RICO charge. The government must prove (1) the existence of the enterprise; (2) that the enterprise affected interstate commerce; (3) that the defendant was employed by or associated with the enterprise; (4) that he participated in the conduct of the affairs of the enterprise; and (5) that he participated through a pattern of racketeering activity. In reviewing the RICO convictions we bear in mind the broad reach of the RICO statute, as articulated in Elliott, 571 F.2d at 903: The substantive proscriptions of the RICO statute apply to insiders and outsiders — those merely “associated with” an enterprise — who participate directly and indirectly in the enterprise’s affairs through a pattern of racketeering activity. (Citations omitted.) Thus, the RICO net is woven tightly to trap even the smallest fish, those peripherally involved with the enterprise. (Emphasis in original.) Even with a tightly woven net however, a fish, of whatever size, cannot be trapped unless he is “employed by or associated with” the enterprise. In other words, the fish must first be swimming in the stream where the net has been placed before we reach the question of size. The indications from Elliott that only minimal association is necessary have caused fine lines to be drawn in determining those who are guilty of violating RICO and those who are not. A defendant must know something about his co-defendants’ related activities which make up the enterprise, but it is not necessary that he be aware of all racketeering activities of each of his partners in the enterprise. Diecidue. To convict on a charge of conspiracy, the government must prove that the defendant had knowledge of the conspiracy and that he intended to join in the objectives of the conspiracy. The degree of criminal intent necessary for participation in a conspiracy must be at least equal to that required for the substantive offense itself. Malatesta. More specifically, to convict for conspiracy to violate RICO the government must prove that the person objectively manifested, through words or actions, an agreement to participate in the conduct of the affairs of the enterprise through the commission of two or more predicate crimes. Bright and Elliott. 2. Mail Fraud Convictions The elements of the offense of mail fraud have been discussed in numerous decisions in this circuit, including the concise distillation in United States v. Green, 494 F.2d 820, 823-24 (5th Cir.), cert. denied, 419 U.S. 1004, 95 S.Ct. 325, 42 L.Ed.2d 280 (1974): The two basic elements of a mail fraud scheme are (1) the scheme to defraud, and (2) causing a mailing for the purpose of executing the scheme. While the mailing must, as the statute requires, be “for the purpose of executing the scheme ... [i]t is not necessary that the scheme contemplate the use of the mails as an essential element. Indeed, it is sufficient if the mailing that is caused is “a part of the execution of the fraud,” or is “incident to an essential part of the scheme.” One “causes” the mails to be used when one “does an act with knowledge that the use of the mails will follow in the ordinary course of business, or where such use can reasonably be foreseen, even though not actually intended.” (Citations omitted.) Thus, it is clear that if there is sufficient evidence to connect a defendant to the fraudulent scheme involving use of the mails, it is not necessary that he do any of the mailing. Co-schemers are jointly responsible for each other’s acts when the acts are within the general scope and in furtherance of the scheme. United States v. Rodgers, 624 F.2d 1303 (5th Cir. 1980). With these elements and standards in mind, we examine the claims of the various defendants that the evidence was insufficient to justify their convictions. THE ARSONISTS Frank Scionti: Scionti was found guilty on both RICO counts (Counts 1 and 2) and on four counts of mail fraud (Counts 3, 4, 5 and 6). Counts 3 and 4 dealt with the fire at 1811 Taliaferro Street. Counts 5 and 6 pertained to the laundromat fire in Miami. Scionti does not specifically assert that the evidence was insufficient to support his convictions on the mail fraud counts. The jury’s verdict is therefore not challenged on those four counts. Furthermore, he concedes that the evidence was sufficient to support his convictions if the testimony of Noriega is to be accepted. His argument that Noriega was incompetent as a witness and because of his mental condition could not be considered credible as a matter of law, has been discussed and decided adversely to him. See United States v. Parker, 586 F.2d 422 (5th Cir. 1978), cert. denied, 441 U.S. 962, 99 S.Ct. 2408, 60 L.Ed.2d 1067 (1979); Jackson, supra. We affirm Scionti’s convictions. Paul Guarino: Guarino was convicted on both RICO counts and on fifteen counts of mail fraud. He does not specifically challenge the sufficiency of the evidence on any count. In his brief, he posits the “Statement of Issues,” which does not question the sufficiency of the evidence, and then adopts the arguments advanced by the co-defendants in support of those issues and any other issues they raised