Full opinion text
Dissenting opinion filed by Senior Judge Randolph. Millett, Circuit Judge: Browning-Ferris Industries of California, Inc. operates one of the largest recycling plants in the world. To operate its plant, Browning-Ferris contracts with Leadpoint Business Services to provide workers to sort through the incoming material, clear jams that occur in the sorting process, and keep the sorting areas clean. In 2013, a local union petitioned to represent those workers as a bargaining unit under the National Labor Relations Act, see 29 U.S.C. § 159(a), designating Browning-Ferris and Leadpoint as "joint employers" of the workers. In concluding that Browning-Ferris and Leadpoint were joint employers of the workers in the petitioned-for unit, the National Labor Relations Board ruled that it would consider a putative joint employer's reserved right to control the workers at issue, as well as any indirect control exercised over the workers, as among a number of factors relevant to determining joint-employer status. Browning-Ferris challenges both of those aspects of the Board's test. We hold that the right-to-control element of the Board's joint-employer standard has deep roots in the common law. The common law also permits consideration of those forms of indirect control that play a relevant part in determining the essential terms and conditions of employment. Accordingly, we affirm the Board's articulation of the joint-employer test as including consideration of both an employer's reserved right to control and its indirect control over employees' terms and conditions of employment. But because the Board did not confine its consideration of indirect control consistently with common-law limitations, we grant the petition for review in part, deny the cross-application for enforcement, dismiss without prejudice the application for enforcement as to Leadpoint, and remand for further proceedings consistent with this opinion. I A Congress enacted the National Labor Relations Act of 1935, 29 U.S.C. § 151 et seq. , to "protect the right of workers to act together to better their working conditions," NLRB v. Washington Aluminum Co. , 370 U.S. 9, 14, 82 S.Ct. 1099, 8 L.Ed.2d 298 (1962), and to "promot[e] stable collective-bargaining relationships," Auciello Iron Works, Inc. v. NLRB , 517 U.S. 781, 790, 116 S.Ct. 1754, 135 L.Ed.2d 64 (1996). To that end, the Act mediates the relationship between "employees" and "employers" by, among other things, conferring upon employees a right to unionize, 29 U.S.C. § 157, prohibiting employers from engaging in specified unfair labor practices, id. § 158(a), and imposing obligations on employers to collectively bargain with representatives of employees, id. § 158(d). The National Labor Relations Board is charged with administering the Act. Id. § 153; NLRB v. SW General, Inc., --- U.S. ----, 137 S.Ct. 929, 937, 197 L.Ed.2d 263 (2017). But how do those statutory obligations on employers work when an employee has more than one putative employer? After all, a Board order that an employer bargain with a union over the terms and conditions of employment may well be futile if another entity, not subject to an order to bargain, exercises the final say over a working condition or has the power to override a choice negotiated in a collective-bargaining agreement. See Herbert Harvey, Inc. v. NLRB , 385 F.2d 684, 686 (D.C. Cir. 1967) (discussing such a situation). To address that not-uncommon scenario, the Board has long recognized that two entities may be joint employers in the eyes of the National Labor Relations Act. See, e.g. , Franklin Simon & Co. , 94 N.L.R.B. 576, 579 (1951). This case involves the standard that the Board applies in making that joint-employer determination. On this point, the National Labor Relations Act gives no direct guidance. The Act provides no relevant definition of "employer," let alone of "joint employer." See 29 U.S.C. § 152(2) (providing only that the term "employer" "includes any person acting as an agent of an employer, directly or indirectly" and excluding listed entities not relevant here). The Supreme Court, meanwhile, has addressed the question of joint-employer status under the Act only once. In Boire v. Greyhound Corp. , 376 U.S. 473, 84 S.Ct. 894, 11 L.Ed.2d 849 (1964), the Court held that a putative joint employer must "possess[ ] sufficient control over the work of the employees to qualify as a joint employer," id. at 481, 84 S.Ct. 894. That inquiry, the Court stressed, is essentially "factual," and is not controlled by the fact that one putative employer is an independent contractor of another. See id. In the years that followed, the test that courts and the National Labor Relations Board applied to determine joint-employer status resisted consistency or reliable delineation. Compare, e.g. , Springfield Ret. Residence , 235 N.L.R.B. 884, 891 (1978) (finding joint-employer status where employer had the power to hire and fire), with, e.g. , Mobil Oil Corp. , 219 N.L.R.B. 511, 515-516 (1975) (finding joint-employer status where employer had the power to set working conditions and make personnel decisions). Almost twenty years later, the Third Circuit articulated a standard around which both the Board and courts began to coalesce. In NLRB v. Browning-Ferris Industries of Pennsylvania, Inc. , 691 F.2d 1117 (3d Cir. 1982), the Third Circuit ruled that separate business entities are joint employers if they each "exert significant control over the same employees" in that they "share or co-determine those matters governing essential terms and conditions of employment," id. at 1124 ; see also id. at 1123. The Board soon adopted that same articulation of the test. See TLI, Inc. , 271 N.L.R.B. 798, 798 (1984) ; Laerco Transp. & Warehouse , 269 N.L.R.B. 324, 325 (1984). This court's test for joint-employer status, like that of a number of other circuits, echoes the Third Circuit's standard, holding that "[t]wo separate entities may be joint employers of 'a single * * * [work force] if they share or co-determine those matters governing [the] essential terms and conditions of employment,' " Dunkin' Donuts Mid-Atlantic Distrib. Ctr., Inc. v. NLRB , 363 F.3d 437, 440 (D.C. Cir. 2004) (quoting Aldworth Co. , 338 N.L.R.B. 137, 139 (2002) ). See also 3750 Orange Place Ltd. P'ship v. NLRB , 333 F.3d 646, 660 (6th Cir. 2003) ; Holyoke Visiting Nurses Ass'n v. NLRB , 11 F.3d 302, 306 (1st Cir. 1993). Following Laerco and TLI , however, the Board added additional requirements that constricted the joint-employer test. For one thing, the Board said that a joint-employer relationship depends on evidence of the actual exercise of control by each employer, not merely a reserved right to control. See AM Property Holding Corp. , 350 N.L.R.B. 998, 1000 (2007) (Board "does not rely merely on the existence of * * * contractual provisions" to determine whether a joint-employer relationship exists, but "rather looks to the actual practice of the parties"). In addition, the Board held that "[t]he essential element in [the] analysis is whether a putative joint employer's control over employment matters is direct and immediate." In re Airborne Freight Co. , 338 N.L.R.B. 597, 597 n.1 (2002). For several years, then, the Board would rely in analyzing joint-employer claims only on evidence of (i) actual control, as opposed to the right to control, and (ii) direct and immediate control, not indirect control. See NLRB v. CNN America, Inc. , 865 F.3d 740, 748-749 (D.C. Cir. 2017). The Board's decision in this case changed both of those factors by making the right to control and indirect control relevant considerations in determining joint employer status. B Browning-Ferris operates the Newby Island Recyclery in Milpitas, California. As one of the largest recycling facilities in the world, Newby Island receives approximately 1,200 tons of mixed materials, waste, and recyclables every day. Inside the facility, four conveyor belts-called "sort lines" or "material streams"-carry different categories of materials that must be sorted so that the remaining portion may be recycled. This case involves three groups of Newby Island workers: sorters, screen cleaners, and housekeepers. Sorters, as the title suggests, remove and sort non-recyclable materials from the stream lines coming into the facility. Screen cleaners clear jams in the sort lines. Housekeepers clean the areas around the sort lines. Browning-Ferris, by itself, employs approximately sixty workers at Newby Island. Most of those individuals work outside of the facility as loader operators, equipment operators, forklift operators, and sort-line equipment operators. One of those Browning-Ferris employees, however, is a sorter. Browning-Ferris also has supervisors who oversee and manage the operations of its employees. While Browning-Ferris employs the one sorter, it does not by itself employ the other sorters, or any screen cleaners or housekeepers. Instead, Browning-Ferris contracts with a staffing agency to provide those workers. In 2009, Browning-Ferris entered into an exclusive service contract with Leadpoint, known as the Temporary Labor Services Agreement ("Agreement"), to staff Newby Island's sorting, screen cleaning, and housekeeping positions. Leadpoint provides approximately 240 workers for Browning-Ferris's Newby Island plant, most of whom fill the sorting, screen cleaning, and housekeeping positions. In addition, Leadpoint employs its own onsite managers and supervisors who oversee the sorters, screen cleaners, and housekeepers. Under the Agreement, Leadpoint handles the hiring of workers from start to finish, but must ensure that the sorters, screen cleaners, and housekeepers at Newby Island meet certain conditions and qualifications required by Browning-Ferris in the Agreement. Those conditions include passing a "five-panel urinalysis drug screen" or equivalent drug test, and "hav[ing] the appropriate qualifications * * *, consistent with all applicable laws and instructions from [Browning-Ferris], to perform the general duties of the assigned position." J.A. 19. The Agreement further provides that Leadpoint workers cannot be assigned to Newby Island for more than six months at a time. But evidence in the record indicates that the time limit is not consistently enforced and some Leadpoint workers have continued working for more than six months. Leadpoint "has the sole responsibility to counsel, discipline, review, evaluate, determine pay rates, and terminate" the workers that it provides to Browning-Ferris. J.A. 20. Browning-Ferris "reserves the right to ensure that" personnel from Leadpoint work "free from the effects of alcohol and illegal drug use." Id. Browning-Ferris also "may reject" or "discontinue the use of" a worker at its facility "for any or no reason." J.A. 21. Leadpoint is responsible for paying the workers, as well as providing their benefits and unemployment insurance. Leadpoint determines the wages the workers will be paid, and it sends Browning-Ferris weekly invoices documenting the services performed and the total hours clocked by the workers. While Browning-Ferris generally has no direct input on the wages that Leadpoint pays, a March 2013 increase in the local minimum wage prompted Leadpoint and Browning-Ferris to amend the Agreement's wage schedule to comply with the new law. In addition, the Agreement provides that Leadpoint workers may not, without approval from Browning-Ferris, earn a higher wage than that earned by any Browning-Ferris worker performing similar tasks. The lone Browning-Ferris sorter earns approximately five dollars more per hour than all of the Leadpoint sorters. For all workers at Newby Island, Browning-Ferris has determined that there will be three shifts per day, and it sets the hours for those shifts. Each shift lasts approximately eight hours, but may occasionally run into overtime. In addition, Browning-Ferris supervisors decide daily which of the four sort lines will run and provide Leadpoint supervisors with a target headcount of how many workers will be needed to operate those lines. Browning-Ferris does not decide which workers will work on which sort lines or during which shifts; Leadpoint makes that call. If Browning-Ferris supervisors determine that a sort line will run overtime, they convey that information to Leadpoint supervisors, who then make the necessary staffing arrangements. The Board found inconsistencies in the frequency and nature of Browning-Ferris supervisors' communications with the workers. Some Browning-Ferris supervisors testified that their only direct communication with the workers involved referring the workers and any problems they raised to Leadpoint supervisors. According to those Browning-Ferris supervisors, they did not directly or specifically instruct those workers on how to perform their jobs. Instead, if they spotted something untoward, they would just tell Leadpoint supervisors "that there's a problem." J.A. 141. For example, the sorting lines are designed with an emergency stop switch to halt the flow of materials. One Browning-Ferris supervisor explained that he and his colleagues generally instruct Leadpoint supervisors, not the workers, on when the emergency stop switch can be used. They left it up to the Leadpoint supervisors to convey that information to the sorters. Some workers at the Newby facility had different experiences. They testified that Browning-Ferris supervisors would occasionally direct the workers' removal of materials from the sort lines or their cleaning of certain areas, and would also warn them against pressing the emergency stop switch too frequently. In addition, a Browning-Ferris supervisor admitted that he had at times held informal meetings with sorters to teach them how to differentiate between organic and inorganic material on the sort lines. Although the Agreement makes Leadpoint ultimately responsible for disciplining the workers it provides, Browning-Ferris has, on occasion, alerted Leadpoint supervisors to incidents that Browning-Ferris believed warranted disciplinary action. For example, in June 2013, a Browning-Ferris supervisor, Paul Keck, sent an email "request[ing] the[ ] immediate dismissal" of a worker seen passing a bottle of alcohol and the worker to whom it was passed. J.A. 34. A Leadpoint supervisor questioned both workers and sent them to a clinic for drug and alcohol testing. Based on the results of the testing, one of the workers was terminated from Leadpoint's employ, and the other continued to work for Leadpoint, but was reassigned to another company's facility. Keck later testified that he did not know what action Leadpoint had taken with respect to those two workers, although he noticed that one was no longer at Newby and was unsure about the other. In that same e-mail, Keck informed the Leadpoint supervisor that he had reviewed video surveillance tapes showing a Leadpoint worker damaging a wall mount. Keck closed the e-mail by stating: "I hope you'll agree [that] this Leadpoint employee should be immediately dismissed." J.A. 34. Following the e-mail, Leadpoint supervisors first suspended and then terminated the worker involved for destroying or defacing property. Keck again testified that he did not follow up to learn what happened to that employee. On another occasion, Keck advised a Leadpoint supervisor that the size of a pre-sort line should be reduced by two workers per shift, and that two other workers on the pre-sort line should be repositioned. The e-mail closed with: "This staffing change is effective Monday, August 5, 2013." J.A. 32. C 1 In July 2013, the International Brotherhood of Teamsters Local 350 ("Union") filed a petition with the Board seeking to represent a new bargaining unit consisting of "full time and regular part-time employees" that were "employed by [Leadpoint] and [Browning-Ferris], joint employers," at Newby Island. J.A. 344. As relevant here, the petitioned-for unit included Leadpoint sorters, housekeepers, and screen cleaners, but not Leadpoint supervisors. At the time, the Union already represented a separate bargaining unit consisting of the sixty workers at Newby Island directly employed by Browning-Ferris, including the sole Browning-Ferris sorter. After an evidentiary hearing, the Acting Regional Director concluded that Browning-Ferris and Leadpoint were not joint employers of the workers in the petitioned-for bargaining unit. Instead, the Director concluded that employees of Leadpoint alone composed the appropriate bargaining unit, and directed that an election be held for that unit. In the Director's view, the evidence was insufficient to establish that Browning-Ferris controlled or co-determined those matters governing the essential terms and conditions of the workers' employment, such as wages, benefits, hiring, discipline, termination, daily work responsibilities, and shift schedules. The Union filed a petition for review, and the Board solicited briefing from the parties and any interested amici on whether the joint-employer test should be updated and how it should apply in this case. On August 27, 2015, the Board issued a decision concluding that Browning-Ferris and Leadpoint are joint employers of the workers in the petitioned-for bargaining unit. Browning-Ferris Indus. of Cal., Inc. , 362 N.L.R.B. No. 186, at 2 (Aug. 27, 2015). In so ruling, the Board "restate[d]" and "reaffirm[ed]" its longstanding joint-employer standard, adopted from the Third Circuit's Browning-Ferris decision, under which "two or more statutory employers are joint employers of the same statutory employees if they 'share or codetermine those matters governing the essential terms and conditions of employment.' " Id. (citation omitted). In applying that test, the Board announced for the first time that it would subdivide the inquiry, asking first "whether there is a common-law employment relationship with the employees in question." Browning-Ferris , 362 N.L.R.B. No. 186, at 2. If so, the Board would ask secondly "whether the putative joint employer possesses sufficient control over employees' essential terms and conditions of employment to permit meaningful collective bargaining." Id. In applying both prongs of that test, the Board announced that it would "no longer require that a joint employer not only possess the authority to control employees' terms and conditions of employment, but also exercise that authority." Id. Nor would the Board anymore demand that "a statutory employer's control * * * be exercised directly and immediately" "to be relevant to the joint-employer inquiry." Id. Instead, the Board would consider both reserved control and indirect control as potentially "probative" in the joint-employer analysis. See id. at 2, 13, 16, 17 n.94. Applying that test, the Board concluded that Browning-Ferris and Leadpoint were joint employers of the workers in the petitioned-for bargaining unit. Browning-Ferris , 362 N.L.R.B. No. 186, at 20. Among the evidence the Board viewed as demonstrating Browning-Ferris's control were Keck's reports of misconduct by workers and requests for their discipline and removal; Browning-Ferris's control over the speed of the sort lines, including direct admonitions to workers to sort faster, work smarter, and not stop the sort lines; and the contractual condition that workers earn no more than Browning-Ferris employees performing similar work. Id. at 18-20. Two members of the Board dissented. In their view, the requirements that control actually be exercised and that it be direct and immediate were required by the common law of agency. See Browning-Ferris , 362 N.L.R.B. No. 186, at 28-32 (Members Miscimarra & Johnson, dissenting). The dissent also expressed concern that retroactive application of the new aspects of the test would disrupt the longstanding expectations of parties who had structured their labor relationships based on the Board's previous joint-employer standard. See id. at 22-23. Browning-Ferris timely petitioned for review of the Board's order, while the Board cross-applied for enforcement of the order against Browning-Ferris and separately applied for enforcement of the order against Leadpoint. 2 While this case was pending, the Board again changed course on the joint-employer question. In Hy-Brand Industrial Contractors, Ltd. , 365 N.L.R.B. No. 156 (Dec. 14, 2017) (later overruled by Hy-Brand Industrial Contractors, Ltd. , 366 N.L.R.B. No. 26 (Feb. 26 2018) ), the Board expressly overruled its Browning-Ferris decision and announced that "a finding of joint-employer status" would require (1) "proof that the alleged joint-employer entities have actually exercised joint control over essential employment terms (rather than merely having 'reserved' the right to exercise control)," (2) the control exercised "must be 'direct and immediate' (rather than indirect)," and (3) "joint-employer status will not result from control that is 'limited and routine.' " Id. at 35. Following the Hy-Brand decision, the Board moved this court to remand Browning-Ferris's case to the agency for further consideration. We granted that motion on December 22, 2017. While that remand was still pending before the Board, an investigation conducted by the Board's Inspector General uncovered that one of the Board members that decided the Hy-Brand case was a shareholder in the law firm that represented Leadpoint before the Board in Browning-Ferris . On that basis, the Inspector General concluded that the Member's participation in the Hy-Brand decision amounted to "a serious and flagrant problem and/or deficiency in the Board's administration of its deliberative process." Memorandum of NLRB Inspector General David P. Berry (Feb. 9, 2018), available at https://www.nlrb.gov/who-we-are/inspector-general. The Inspector General explained that "the practical effect of the Hy-Brand deliberative process was a 'do over' for the Browning-Ferris parties," and so that Member should have recused himself. Id. at 2, 5. In light of the Inspector General's report, the Board unanimously vacated its Hy-Brand decision and announced that "the overruling of the Browning-Ferris decision is of no force or effect." Hy-Brand Industrial Contractors, Ltd. , 366 N.L.R.B. No. 26 (Feb. 26, 2018). The Board then moved this court to recall its remand mandate and asked this court to proceed with resolving Browning-Ferris's petition for review and the Board's cross-application for enforcement. We granted that motion on April 6, 2018, and recalled our mandate, but held the case in abeyance pending the Board's disposition of Hy-Brand's motion for reconsideration. The Board denied reconsideration two months later. Hy-Brand Industrial Contractors, Ltd. , 366 N.L.R.B. No. 93 (June 6, 2018). On May 9, 2018, the Board announced its plan to undertake a rulemaking on the standard for joint-employer status. The Board was explicit that any new rule that might result from that process would be prospective only. Browning-Ferris Mot. to Remand at 9, 12 (June 13, 2018). In June 2018, the Board specifically requested that this court proceed to decide the case, notwithstanding the pending rulemaking. See Board Opp. to Mot. to Remand (June 15, 2018); see also Board Mot. to Govern Future Proceedings (June 13, 2018); Tr. of Oral Argument at 13 (July 3, 2018). On September 14, 2018, the Board published its notice of proposed rulemaking that suggested reinstating its prior "direct and immediate control" test for joint-employer status. "[T]o be deemed a joint employer under the proposed regulation, an employer must possess and actually exercise substantial direct and immediate control over the employees' essential terms and conditions of employment of another employer's employees in a manner that is not limited and routine." 83 Fed. Reg. 46681, 46686 (Sept. 14, 2018). Since issuing its proposed rule, the Board has reiterated its request that this court resolve the pending petitions for review in this case. See Letter from Linda Dreeben, Deputy Associate General Counsel, National Labor Relations Board to Mark J. Langer, Clerk of Court, U.S. Court of Appeals for the District of Columbia Circuit (September 19, 2018). II We start with the question of what, if any, deference is owed to the Board's adjustments to the joint-employer standard. The Board claims that its "reasonable" judgment merits "considerable deference." See Board Br. 16 (citations omitted); cf. Chevron, U.S.A., Inc. v. Natural Resources Def. Council, Inc. , 467 U.S. 837, 842-844, 104 S.Ct. 2778, 81 L.Ed.2d 694 (1984) (courts defer to an agency's "reasonable interpretation" of ambiguous terms in a statute administered by the agency). Browning-Ferris says that the Board gets no deference. We hold that, to the extent that the Board's joint-employer standard is predicated on interpreting the common law, Browning-Ferris is correct. The content and meaning of the common law is a pure question of law that we review de novo without deference to the Board. Under Supreme Court and circuit precedent, the National Labor Relations Act's test for joint-employer status is determined by the common law of agency. The Supreme Court has often held that, when Congress leaves undefined statutory terms like "employee" and "employer" that have longstanding common-law meanings, courts should presume that Congress intended to incorporate those meanings, unless the statute, directs otherwise. See Microsoft Corp. v. i4i Ltd. P'ship , 564 U.S. 91, 103, 131 S.Ct. 2238, 180 L.Ed.2d 131 (2011) ("Where Congress uses terms that have accumulated settled meaning under * * * the common law, [we] must infer, unless the statute otherwise dictates, that Congress means to incorporate the established meaning of those terms.") (alterations in original) (quoting Neder v. United States , 527 U.S. 1, 21, 119 S.Ct. 1827, 144 L.Ed.2d 35 (1999) ); Community for Creative Non-Violence v. Reid , 490 U.S. 730, 739-740, 109 S.Ct. 2166, 104 L.Ed.2d 811 (1989) ("[W]hen Congress has used the term 'employee' without defining it, * * * Congress intended to describe the conventional master-servant relationship as understood by common-law agency doctrine."); id. (citing additional cases holding that "employee," "employer," and "scope of employment" must be interpreted in light of agency law). That presumption applies with full force to the employer-employee relationship under the National Labor Relations Act. In NLRB v. Hearst Publications, Inc. , 322 U.S. 111, 64 S.Ct. 851, 88 L.Ed. 1170 (1944), the Supreme Court bypassed the common-law meaning of "employee" in favor of a definition that potentially swept in independent contractors, reasoning that the latter definition better advanced the policies underlying the National Labor Relations Act, see id. at 131-132, 64 S.Ct. 851. Congress promptly and emphatically rejected that approach, amending the Act to specifically exclude "independent contractors" from the Act's definition of "employees." See Labor Management Relations Act of 1947, Pub. L. 80-101, 61 Stat. 136 (codified as amended at 29 U.S.C. §§ 141 - 197 ) ("Taft-Hartley Amendments"). "The obvious purpose" of the Taft-Hartley Amendments, the Supreme Court later ruled, "was to have the Board and the courts apply general [common-law] agency principles in distinguishing between employees and independent contractors under the Act." NLRB v. United Insurance Co. of America , 390 U.S. 254, 256, 88 S.Ct. 988, 19 L.Ed.2d 1083 (1968) ; see also Nationwide Mut. Ins. Co. v. Darden , 503 U.S. 318, 324-325, 112 S.Ct. 1344, 117 L.Ed.2d 581 (1992) (explaining the congressional reaction to Hearst ). For purposes of determining our standard of review, the lesson from the Taft-Hartley Amendments and United Insurance is that Congress delegated to the Board the authority to make tough calls on matters concerning labor relations, but not the power to recast traditional common-law principles of agency in identifying covered employees and employers. Instead, the inquiry into the content and meaning of the common law is a "pure" question of law, and its resolution requires "no special administrative expertise that a court does not possess." United Insurance , 390 U.S. at 260, 88 S.Ct. 988. For that reason, we review the Board's interpretation of the common law de novo . See FedEx Home Delivery v. NLRB , 849 F.3d 1123, 1128 (D.C. Cir. 2017) ("[T]his particular question [regarding who is an employee or independent contractor] under the Act is not one to which we grant the Board Chevron deference[.]"); cf. International Longshoremen's Ass'n v. NLRB , 56 F.3d 205, 212 (D.C. Cir. 1995) (because the term "agent" in the Act "incorporat[es] common law agency principles," courts do not "defer to the agency's judgment as we normally might under [ Chevron ]"). That no-deference rule applies just as much to the common-law meaning of "employer" under the Act as it does to that of "employee." That is because both inquiries turn on pure questions of law about the scope of traditional common-law agency principles. Cf. Community for Creative Non-Violence , 490 U.S. at 739-740, 109 S.Ct. 2166. The Board argues that, even if its articulation of the common law does not get full-fledged Chevron deference, the proper standard of review is still not de novo . Citing language in Atrium of Princeton, LLC v. NLRB , 684 F.3d 1310 (D.C. Cir. 2012), and International Longshoremen's Association , 56 F.3d at 212, the Board argues that we must accept its understanding of the common law so long as it reflects a choice between "two fairly conflicting views." Board Br. 16 (citation omitted). That is not correct. The "two fairly conflicting views" standard applies to the Board's application of the common law to the facts of a particular case-which is a mixed question of law and fact. It does not extend to the Board's articulation of the common law, which is a pure question of law. See FedEx , 849 F.3d at 1128 ; Aurora Packing Co. v. NLRB , 904 F.2d 73, 75 (D.C. Cir. 1990) ("[D]eference would only be extended to the Board's determination of employee status-an 'application of law to fact'-insofar as [the Board] made a 'choice between two fairly conflicting views' in a particular case.") (quoting United Insurance , 390 U.S. at 260, 88 S.Ct. 988 ). Our decisions in Atrium of Princeton and International Longshoremen's Association are of the same mind. See Atrium of Princeton , 684 F.3d at 1315-1316 (rejecting the Board's formulation of the relevant common-law agency standard and effectively applying de novo analysis of the common law); International Longshoremen's Ass'n , 56 F.3d at 213 (finding no dispute as to the "fundamental principle of hornbook agency law" that governed, and applying the "two fairly conflicting views" standard only to the Board's application of the law to the facts). We also note that the Board's decision in Hy-Brand agreed that courts owe its interpretation of the common law no deference. Hy-Brand , 365 N.L.R.B. No. 156 at 4. For those reasons, we review de novo whether the Board's joint-employer test comports with traditional common-law principles of agency. Finally, it is precisely because Congress has tasked the courts, and not the Board, with defining the common-law scope of "employer" that this court accepts the Board's repeated request that we resolve this case notwithstanding the pending rulemaking. The policy expertise that the Board brings to bear on applying the National Labor Relations Act to joint employers is bounded by the common-law's definition of a joint employer. The Board's rulemaking, in other words, must color within the common-law lines identified by the judiciary. That presumably is why the Board has thrice asked this court to dispose of the petitions in this case during its rulemaking process. Like the Board, and unlike the dissenting opinion (at pp. 4-8), we see no point to waiting for the Board to take the first bite of an apple that is outside of its orchard. III The Board was certainly correct that, for roughly the last 25 years, the governing framework for the joint-employer inquiry has been whether both employers "exert significant control over the same employees" in that they "share or co-determine those matters governing the essential terms and conditions of employment." Browning-Ferris , 691 F.2d at 1124. This court so held in Dunkin' Donuts , 363 F.3d at 440. The question in this case is whether the common-law analysis of joint-employer status can factor in both (i) an employer's authorized but unexercised forms of control, and (ii) an employer's indirect control over employees' terms and conditions of employment. See Browning-Ferris , 362 N.L.R.B. No. 186, at 2. In answering that question, we look first and foremost to the "established" common-law definitions at the time Congress enacted the National Labor Relations Act in 1935 and the Taft-Hartley Amendments in 1947, Microsoft , 564 U.S. at 103, 131 S.Ct. 2238 (citation omitted). See Field v. Mans , 516 U.S. 59, 70, 116 S.Ct. 437, 133 L.Ed.2d 351 (1995) ("look[ing] to the [common-law] concept of 'actual fraud' as it was understood in 1978 when that language was added to [the statute]"). We conclude that the Board's right-to-control standard is an established aspect of the common law of agency. The Board also correctly determined that the common-law inquiry is not woodenly confined to indicia of direct and immediate control; an employer's indirect control over employees can be a relevant consideration. The Board in Hy-Brand , in fact, agreed that both reserved and indirect control are relevant considerations recognized in the common law. See Hy-Brand, 365 N.L.R.B. No 156 at 4. In applying the indirect-control factor in this case, however, the Board failed to confine it to indirect control over the essential terms and conditions of the workers' employment. We accordingly remand that aspect of the decision to the Board for it to explain and apply its test in a manner that hews to the common law of agency. A 1 The Board's conclusion that joint-employer status considers not only the control an employer actually exercises over workers, but also the employer's reserved but unexercised right to control the workers and their essential terms and conditions of employment, finds extensive support in the common law of agency. First , this court has already squarely addressed that common-law question. In International Chemical Workers Union Local 483 v. NLRB , 561 F.2d 253 (D.C. Cir. 1977), this court was explicit that "[w]hether [two entities are] joint employers" under the National Labor Relations Act "depends upon the amount of actual and potential control that" the putative joint employer "ha[s] over the * * * employees," id. at 255 (emphasis added). That inquiry, we added, "depend[s] upon the amount of and nature of control that [the putative employer] exercise[s] and [is ] authorized to exercise under the contract." Id. (emphasis added). This court's decision in International Chemical Workers is, of course, binding on this panel. See LaShawn A. v. Barry , 87 F.3d 1389, 1393 (D.C. Cir. 1996) (en banc). The rule established in International Chemical Workers also makes great sense. Retained but unexercised control has long been a relevant factor in assessing the common-law master-servant relationship. The Supreme Court has held that the reserved right to control certain aspects of the work underpins the common-law master-servant dynamic. See Chicago, Rock Island & Pac. Ry. Co. v. Bond , 240 U.S. 449, 456, 36 S.Ct. 403, 60 L.Ed. 735 (1916) (worker held not to be an employee because the company "did not retain the right to direct the manner in which the business should be done, as well as the results to be accomplished, or, in other words, did not retain control not only of what should be done, but how it should be done") (emphases added); Singer Mfg. Co. v. Rahn , 132 U.S. 518, 523, 10 S.Ct. 175, 33 L.Ed. 440 (1889) ("[T]he relation of master and servant exists whenever the employer retains the right to direct the manner in which the business shall be done, as well as the result to be accomplished[.]") (emphasis added). State-court decisions applying the common law of agency are equally clear that unexercised control bears on employer status. That was the common-law rule at the time of the National Labor Relations Act's passage in 1935. That was also the common-law rule at the time of the Taft-Hartley Amendments in 1947. And, for what it is worth, it is still the common-law rule today. In addition, the "right to control" runs like a leitmotif through the Restatement (Second) of Agency. It starts right out of the box with the definitional provision of the master-servant relationship: a "master" "controls or has the right to control the physical conduct of [another] in the performance of [a] service," RESTATEMENT (SECOND) OF AGENCY § 2(1), at 12 ( AM. LAW INST. 1958) (emphasis added), while a "servant" likewise "is controlled or is subject to the right to control by the master," id. § 2(2), at 12 (emphasis added). And that refrain keeps repeating. See id. § 14 cmt. a, at 60 ("The extent of the right to control the physical acts of the agent is an important factor in determining whether or not a master-servant relationship between them exists."); id. § 220(1), at 485; id. § 250 cmt. a, at 550 (identifying the "right to control physical details as to the manner of performance" as "characteristic of the relation of master and servant"). In short, "[a]t common law the relevant factors defining the master-servant relationship focus on the master's control over the servant," whether that means the servant " 'is controlled or is subject to the right to control by the master,' " and so that "common-law element of control is the principal guidepost" in determining whether an entity is an employer of another. Clackamas Gastroenterology Associates, P. C. v. Wells , 538 U.S. 440, 448, 123 S.Ct. 1673, 155 L.Ed.2d 615 (2003) (emphases added) (quoting RESTATEMENT (SECOND) OF AGENCY § 2(2) ). Indeed, precedent is so clear on this point that Browning-Ferris admitted at oral argument that the Board "can consider" unexercised control as a relevant factor in the joint-employer determination. Oral Arg. Tr. at 11:2. The Board's subsequent decision in Hy-Brand agreed as well that reserved control may be one "indicia" that is "probative of joint-employer status" under the common law. Hy-Brand , 365 N.L.R.B. No. 156 at 4. Second , consideration of unexercised control accords with the common law's analogous "dual master doctrine": the concept that "[a] person may," under certain circumstances, "be the servant of two masters * * * at one time as to one act," as long as "the service to one [master] does not involve abandonment of the service to the other," RESTATEMENT (SECOND) OF AGENCY § 226, at 498, and "the act is within the scope of his employment for both," id. § 226 cmt. a, at 499. In the comments to Section 226, the Restatement (Second) specifically notes that the "right of the [putative] master[s] to control the conduct of the servant" is determinative of whether the servant has two masters at the same time. Id. § 226 cmt. a, at 498 (emphasis added). To be sure, Section 226 addresses situations in which an individual is a "servant of two masters, not joint employers ." RESTATEMENT (SECOND) OF AGENCY § 226, at 498 (emphasis added). But if unexercised control is relevant to identifying two distinct employers, that consideration logically applies to identifying simultaneous joint employers as well. Indeed, the Supreme Court has, in the context of the Federal Employers' Liability Act, 45 U.S.C. § 51 et seq. , identified the dual master doctrine as a "common-law" "method[ ] by which [an individual] can establish his 'employment' with [one entity] even while he is nominally employed by another." See Kelley v. Southern Pac. Co. , 419 U.S. 318, 324, 95 S.Ct. 472, 42 L.Ed.2d 498 (1974). 2 Browning-Ferris argues that the "most important" component of the employee-or-independent-contractor inquiry is the "extent of the actual supervision exercised." Browning-Ferris Br. 27 (emphases omitted) (quoting Aurora Packing , 904 F.2d at 76 ). Considering the independent-contractor inquiry to be "essentially the same" as the joint-employer inquiry, id. 31, Browning-Ferris tells us that we should import the same focus here. Both steps of that argument fail. a For starters, the common law's analysis of independent contractor status, if anything, has long agreed that "the right of control and not [merely] the exercise of that right * * * is relevant" to establishing that a worker is an employee rather than an independent contractor. Local 814, Int'l Bhd. of Teamsters v. NLRB , 512 F.2d 564, 571 n.13 (D.C. Cir. 1975) (emphasis added); see, e.g. , Construction, Bldg. Material, Ice & Coal Drivers, Helpers & Inside Employees Union, Local No. 221 v. NLRB , 899 F.2d 1238, 1242 (D.C. Cir. 1990) (R.B. Ginsburg, J.) ("The right to control the 'means and manner' of job performance * * * is * * * recurrent in the cases in point" addressing employee versus independent-contractor status) (emphasis added); Dovell v. Arundel Supply Corp. , 361 F.2d 543, 544 (D.C. Cir. 1966) ("The decisive test in determining whether the relation of master and servant exists is whether the employer has the right to control and direct the servant in the performance of his work and in the manner in which the work is to be done. It will be noted from the above, it is not the manner in which the alleged master actually exercised his authority to control and direct the action of the servant which controls, but it is his right to do so that is important."); Gracev. Magruder , 148 F.2d 679, 681 (D.C. Cir. 1945) ("The vital element which negatives such independence, in the relation between employer and employee, is the right to control the employee, not only as to the final result, but in the performance of the task itself. And, it is the right to control, not control or supervision itself, which is most important."); RESTATEMENT (SECOND) OF AGENCY § 220 (1958) (defining an independent contractor as "a person who contracts with another to do something for him but who is not controlled by the other nor subject to the other's right to control with respect to his physical conduct in the performance of the undertaking.") (emphasis added); cf. Logue v. United States , 412 U.S. 521, 527, 93 S.Ct. 2215, 37 L.Ed.2d 121 (1973) ("[T]he modern common law as reflected in the Restatement of Agency * * * make[s] the distinction between the servant or agent relationship and that of independent contractor turn on the absence of authority in the principal to control the physical conduct of the contractor in performance of the contract.") (emphasis added). Lastly, the parties and amici dispute the appropriateness of relying on the Restatement (Second) of Agency as a relevant source of common law. Some amici argue that the Restatement (Second)'s primary focus is on assigning liability for specific tortious conduct or breaches of contracts, not on determining the relationship between a putative employer and employee. Chamber of Commerce et al. Br. 22-23. Nevertheless, the Supreme Court has repeatedly relied on the Restatement (Second) to answer questions of employment under the common law of agency. See, e.g. , Community for Creative Non-Violence , 490 U.S. at 752 & n.31, 109 S.Ct. 2166 ("In determining whether a hired party is an employee under the general common law of agency, we have traditionally looked for guidance to the Restatement [ (Second) ] of Agency."); Town & Country , 516 U.S. at 94-95, 116 S.Ct. 450 ; Darden , 503 U.S. at 324, 112 S.Ct. 1344. This court too has relied specifically on Section 220 of the Restatement (Second) of Agency to determine whether a worker is an employee or independent contractor under traditional common-law principles in National Labor Relations Act cases. E.g. , FedEx , 849 F.3d at 1125 ; Lancaster Symphony Orchestra v. NLRB , 822 F.3d 563, 565-566 (D.C. Cir. 2016) ; North American Van Lines v. NLRB , 869 F.2d 596, 599-600 (D.C. Cir. 1989). Accordingly, controlling precedent makes the Restatement (Second) of Agency a relevant source of traditional common-law agency standards in the National Labor Relations Act context. In any event, both the first Restatement of Agency and the Restatement (Third) of Agency also identify the "right to control" as a relevant factor in establishing a master-servant or employment relationship. RESTATEMENT OF AGENCY § 2(1)-(2), at 11 ( AM. LAW INST. 1933) (A "master" "controls or has the right to control the physical conduct of the other in the performance of [a] service," while a "servant" "is controlled or is subject to the right to control by the master[.]"); 2 RESTATEMENT (THIRD) OF AGENCY § 7.07(3)(a), at 198 ( AM. LAW INST. 2006) ("For purposes of this section, * * * an employee is an agent whose principal controls or has the right to control the manner and means of the agent's performance of work[.]"). In sum, the Board's conclusion that an employer's authorized or reserved right to control is relevant evidence of a joint-employer relationship wholly accords with traditional common-law principles of agency. And because the Board relied on evidence that Browning-Ferris both had a "right to control" and had "exercised that control," Browning-Ferris , 362 N.L.R.B. No. 186, at 18, this case does not present the question whether the reserved right to control, divorced from any actual exercise of that authority, could alone establish a joint-employer relationship. b Beyond all that, Browning-Ferris's contention that the joint-employer and independent-contractor tests are virtually identical lacks any precedential grounding. Browning-Ferris cites no case in which we have applied an employee-or-independent-contractor test to resolve a question of joint employment, and we have found none. Cf. Redd v. Summers , 232 F.3d 933, 938 (D.C. Cir. 2000) (noting in the Title VII context that "[t]his court has never invoked" the independent-contractor test "to resolve an issue of joint employment," but avoiding the issue). That lack of precedent is understandable because, at bottom, the independent-contractor and joint-employer tests ask different questions. The independent-contractor test considers who, if anyone, controls the worker other than the worker herself. See Lancaster Symphony Orchestra , 822 F.3d at 566. The joint-employer test, by contrast, asks how many employers control individuals who are unquestionably superintendent. In this case, there is no question that the workers Leadpoint provides are employees of (at least) Leadpoint, not independent contractors. See Browning-Ferris Br. 31 n.14 ("It is undisputed that the persons in the petitioned-for bargaining unit are employees, not independent contractors."). Indeed, there is nothing independent at all about those employees' work lives. In addition, an important aspect of the independent-contractor inquiry is whether the workers in question are operating their own independent businesses. See United Insurance , 390 U.S. at 258-259, 88 S.Ct. 988 (listing whether workers "operate their own independent businesses" as a "decisive factor[ ]" in the employee-or-independent-contractor inquiry); RESTATEMENT (SECOND) OF AGENCY § 220(2)(b), at 485 (listing "whether or not the [worker] is engaged in a distinct occupation or business" as a factor in the employee-or-independent-contractor inquiry). That consideration is of no help to the joint-employer inquiry. Similarly, under the Restatement (Second) of Agency, several of the factors that guide the employee-or-independent-contractor determination are aimed at characterizing the nature of the work performed. See , e.g. , RESTATEMENT (SECOND) OF AGENCY § 220(2)(c), at 485 (considering "the kind of occupation, with reference to whether, in the locality, the work is usually done under the direction of the employer or by a specialist without supervision"); id. § 220(2)(d), at 485 (considering "the skill required in the particular occupation"). Those factors shed no meaningful light on the question of Browning-Ferris's status here. To be sure, as Browning-Ferris notes, both tests ultimately probe the existence of a common-law master-servant relationship. And central to establishing a master-servant relationship-whether for purposes of the independent-contractor inquiry or the joint-employer inquiry-is the nature and extent of a putative master's control. Accordingly, employee-or-independent-contractor cases can still be instructive in the joint-employer inquiry to the extent that they elaborate on the nature and extent of control necessary to establish a common-law employment relationship. Beyond that, a rigid focus on independent-contractor analysis omits the vital second step in joint-employer cases, which asks, once control over the workers is found, who is exercising that control, when , and how . In short, using the independent-contractor test exclusively to answer the joint-employer question would be rather like using a hammer to drive in a screw: it only roughly assists the task because the hammer is designed for a different purpose. c The dissenting opinion is of the view that Leadpoint's purported status as an independent contractor per se resolves the issue before us, reasoning that employees of an independent contractor cannot be employees of the company that hired the contractor. See Dissent Op. 9. Controlling precedent says otherwise. In Boire v. Greyhound Corp. , the only Supreme Court case to address the question of joint employer status, the Court was explicit that the joint employer inquiry is "unaffected by any possible determination" that one employer is an independent contractor of another employer. 376 U.S. at 481, 84 S.Ct. 894 (emphasis added); id . ("Greyhound has never suggested that the employees [of the independent contractor] themselves occupy an independent contractor status."). This court's precedent is of the same view. In Herbert Harvey v. NLRB , the World Bank hired Herbert Harvey Inc.-an independent contractor providing building repair services. 385 F.2d at 684-685 ; see Herbert Harvey, Inc. v. NLRB , 424 F.2d 770, 775 (D.C. Cir. 1969) (noting that it was "plain" to the Board that the World Bank and Herbert Harvey contracted for "a completely independent relationship"). We nevertheless held that, as to Herbert Harvey's employees, the "record clearly shows a basis for finding that Harvey and the Bank are joint employers[.]" Id. ; see also International Chem. Workers Union Local 483 v. NLRB , 561 F.2d 253, 256 (D.C. Cir. 1977) (explaining that an employer' status as an independent contractor is "not determinative" of the other putative employer's control over the employees at issue). The dissenting opinion dismisses Boire as a decision about "jurisdiction." Dissenting Op. 1228 n.3. True. But in resolving the question of jurisdiction in Boire , the Supreme Court was explicit that the statutory carve-out from the National Labor Relations Act for independent contractors-and, importantly, a related jurisdictional exception-did not apply because the Board's jurisdiction was "unaffected" by Floors' independent-contractor status. Boire , 376 U.S. at 481, 84 S.Ct. 894. The Supreme Court's analysis of why the independent contractor's status did not solve Greyhound's jurisdictional problem, accordingly, was necessary to the decision. "When an opinion issues for the [Supreme] Court, it is not only the result but also those portions of the opinion necessary to that result by which we are bound." Seminole Tribe of Florida v. Florida , 517 U.S. 44, 67, 116 S.Ct. 1114, 134 L.Ed.2d 252 (1996). So we take the Supreme Court at its word, as did the Fifth Circuit on remand in Boire , NLRB v. Greyhound Corp. , 368 F.2d 778, 780-781 (5th Cir. 1966) (applying the Supreme Court's standard to hold that Greyhound and the independent contractor were joint employers), and the Third Circuit in its watershed joint-employer decision, Browning-Ferris , 691 F.2d at 1122-1123. See also id. at 1123 (noting that, under Boire, Greyhound's status as a joint employer "is unaffected by any possible determination as to Floors' status as an independent contractor") (quoting Boire , 376 U.S. at 481, 84 S.Ct. 894 ). Lastly, the dissenting opinion cites to the 1925 edition of Corpus Juris for the proposition that: An independent contractor is not the servant of his employer. The relation of master and servant does not exist between an employer and the servants of an independent contractor, nor between an independent contractor and the servant of a subcontractor, and he is not responsible as a master, either to or for them. Dissenting Op. 1228 (quoting 39 C.J. Master and Servant § 8, at 37-38 (1925) ) (emphasis omitted). As between Supreme Court precedent and Corpus Juris , we hew to the former. But as it turns out, we need not make that choice here because the cited passage does not stop where the dissenting opinion does. Corpus Juris adds in the very next sentence: If, however, the employer retains or assumes control over the means and method by which the work of a contractor is to be done, the relation of master and servant exists between him and servants of such a contractor, and the mere fact of nominal employment by an independent contractor will not relieve the master of liability where the servant is in fact in his employ. 39 C.J. Master and Servant § 8, at 38 (emphasis added). B The Board also ruled that an employer's control need not "be exercised directly and immediately" "to be relevant to the joint-employer inquiry"; indicia of "indirect[ ]" control can also be considered. Browning-Ferris , 362 N.L.R.B. No. 186, at 2. The Board again correctly discerned the content of the common law-indirect control can be a relevant factor in the joint-employer inquiry. But in failing to distinguish evidence of indirect control that bears on workers' essential terms and conditions from evidence that simply documents the routine parameters of company-to-company contracting, the Board overshot the common-law mark. 1 a Traditional common-law principles of agency do not require that "control * * * be exercised directly and immediately" to be "relevant to the joint-employer inquiry." Browning-Ferris , 362 N.L.R.B. No. 186, at 2 (emphasis added). In fact, the National Labor Relations Act itself expressly recognizes that agents acting "indirectly" on behalf of an employer could also count as employers. 29 U.S.C. § 152(2) (the term "employer" "includes any person acting as an agent of an employer, directly or indirectly"). The Act thus textually indicates that the statute looks at all probative indicia of employer status, whether exercised "directly or indirectly." Id . Browning-Ferris's proposed rigid distinction between direct and indirect control has no anchor in the common law. Neither Browning-Ferris nor the dissenting opinion cites any case holding that consideration of indirect control is forbidden. Nor have we found any. To the contrary, common-law decisions have repeatedly recognized that indirect control over matters commonly determined by an employer can, at a minimum, be weighed in determining one's status as an employer or joint employer, especially insofar as indirect control means control exercised "through an intermediary," id . To begin with, courts applying the traditional common law of agency have explicitly considered indirect control as relevant to the existence of a master-servant relationship. See White v. Morris, 114 Ga.App. 618, 152 S.E.2d 417, 419 (1966) ("[E]vidence and inferences therefrom indicating [a putative employer's] indirect control * * * are relevant for consideration" of "the existence of a master-servant relationship," "because the alleged relationship can exist by virtue of indirect control of the servant's performance as well as by direct control."); Wallowa Valley Stages, Inc. v. Oregonian Pub. Co., 235 Or. 594, 386 P.2d 430, 433 (1963) (en banc) (finding sufficient evidence "that the [putative master] indirectly exercised some control over the detail of [the putative servant's] operations"), repudiated on other grounds by Woody v. Waibel, 276 Or. 189, 554 P.2d 492 (1976) (en banc). In particular, the common law has never countenanced the use of intermediaries or controlled third parties to avoid the creation of a master-servant relationship. See, e.g. , Nicholson v. Atchison, T. & S. F. Ry. Co. , 147 P. 1123, 1126 (Kan. 1915) (putative master's use of "branch company" as a "mere instrumentality" "did not break the relation of master and servant existing between the plaintiff and the [putative master]"); 39 C.J. Master and Servant § 8, at 38 ("Where an independent contractor is created or is operating as a subterfuge, an employee will be regarded as the servant of the principal employer."). Our cases too have considered indirect control relevant to employer status. See, e.g. , Dunkin' Donuts , 363 F.3d at 440 (in addition to direct control, joint employer's warehouse supervisor "reported his opinion about [warehouse applicants'] qualifications, which [contractor] generally followed," and joint employer's transportation manager "prevented hiring of [driver] applicants he did not approve"); Al-Saffy v. Vilsack , 827 F.3d 85, 97 (D.C. Cir. 2016) (in Title VII context, this court cited as relevant evidence supporting reversal of summary judgment the fact that officials working for putative employer had recommended plaintiff's dismissal). In addition, control that is exercised through an intermediary is a defining feature of the subservant doctrine. Much as the joint-employer inquiry arises in situations in which an employee has multiple masters at the same time, the subservant doctrine analogously governs arrangements in which an employee has, as simultaneous masters, both "his immediate employer and [his immediate employer's] master." RESTATEMENT (SECOND) OF AGENCY § 226 cmt. a, at 499. Given the central role that indirect control plays in the subservant doctrine, there is no sound reason that the related joint-employer inquiry would give that factor a cold shoulder. Even the now-vacated Board decision in Hy-Brand acknowledged that indirect control can be relevant to the joint employer question. Hy-Brand , 365 N.L.R.B. No. 156, at 4 ("Our fundamental disagreement with the Browning-Ferris test is not that it treats indicia of indirect, and even potential, control to be probative of joint-employer status, but that it makes such indicia potentially dispositive without any evidence of direct control in even a single area."). There is thus broad agreement that the common law factors indirect control into the analysis of employer status. Accordingly, the Board's conclusion that it need not avert its eyes from indicia of indirect control-including control that is filtered through an intermediary-is consonant with established common law. And that is the only question before this court. Hy-Brand 's concern about whether indirect control can be "dispositive" is not at issue in this case because the Board's decision turned on its finding that Browning-Ferris exercised control "both directly and indirectly." Browning-Ferris , 362 N.L.R.B. No. 186, at 18 ; see also id. at 19 ("We find that all of these forms of control-both direct and indirect-are indicative of an employer-employee relationship."). Browning-Ferris's argument that the common law of agency closes its mind to evidence of indirect control is unsupported by law or logic. First, Browning-Ferris points to a passage in the comments to Section 220 of the RESTATEMENT (SECOND) , which distinguishes employees from independent contractors, and argues that the relevant factors do "not look[ ] to indirect control." Browning