Opinion for the Court filed by Circuit Judge KAVANAUGH.
This case arises out of a labor dispute between the Raymond F. Kravis Center for the Performing Arts in West Palm Beach, Florida, and Local 623 of the International Alliance of Theatrical Stage Employees and Moving Picture Technicians and Allied Crafts. Kravis and the union entered into collective bargaining agreements that established an exclusive hiring hall arrangement: Kravis would use only employees referred by Local 623 to perform all stagehand work at Kravis’s Drey-foos Hall. After the agreements expired, Kravis declared impasse during contract renegotiations, withdrew recognition from the union, and did not request further referrals from it.
The National Labor Relations Board ruled that Kravis violated §§ 8(a)(5) and (1) of the National Labor Relations Act by, among other things, unilaterally changing the scope of the bargaining unit and withdrawing recognition from Local 623. The Board also determined that, as a result of a union merger, Local 500 was the successor union to Local 623. It ordered Kravis to recognize and bargain with Local 500 as the exclusive representative of Kravis’s stagehand employees. Kravis filed a petition for review in this Court. We deny the petition for review and grant the Board’s cross-application for enforcement.
I
The Kravis Center for the Performing Arts is a concert hall and theater complex in West Palm Beach, Florida. In 1992, Kravis and Local 623 of the International Alliance of Theatrical Stage Employees and Moving Picture Technicians and Allied Crafts entered into a five-year collective bargaining agreement. The agreement provided for an exclusive hiring hall arrangement under which Local 623 would provide the stagehand employees at Kra-vis’s concert venue, Dreyfoos Hall, as the need arose — specifically, carpenters, electricians, flymen and riggers, props, and wardrobe employees. In 1998, the parties renewed the contract for two more years, effective until June 2000.
*1187 In April 2000, Kravis notified Local 623 of its intent to terminate the 1998 agreement upon its expiration. The parties negotiated from May to September 2000. After various proposals were bandied back and forth, Kravis submitted its final bargaining proposal on September 9, 2000. The proposal included discretionary use of Local 623 referrals, an unfettered right to subcontract stagehand work, and contract terms that would apply only to Local 623-referred workers, not to other stagehand workers at Dreyfoos Hall.
On September 11, 2000, Kravis declared impasse and unilaterally implemented its final proposal. On September 24, 2000, Kravis withdrew recognition from Local 623, and thereafter requested no further referrals from Local 623 for stagehand employees at Dreyfoos Hall.
In March 2001, Local 623 filed unfair labor practice charges. After an investigation, the NLRB’s General Counsel filed a complaint.
Meanwhile, in February 2002, Local 623 merged with five other local theater-employee unions in south Florida to form a new Local 500. Local 623 members did not vote on the union merger.
After a hearing on the General Counsel’s complaint, an administrative law judge found that Kravis violated §§ 8(a)(5) and 8(a)(1) of the National Labor Relations Act by, among other things, unilaterally changing the scope of the bargaining unit to exclude non-referred stagehands and by withdrawing recognition from Local 623. However, the ALJ concluded that Local 623 ceased to exist as a result of the 2002 merger that formed Local 500 and that Kravis’s bargaining obligation had ended on that date. All parties filed exceptions.
The Board affirmed the finding that Kravis violated §§ 8(a)(5) and 8(a)(1). It reasoned that the parties’ relationship, based on the agreements in effect since 1992, constituted a § 9(a) collective bargaining relationship, rendering unlawful Kravis’s unilateral change to the bargaining unit and withdrawal of recognition from the union. The Board also rejected the ALJ’s determination that the 2002 union merger terminated Kravis’s bargaining obligation. Overruling its traditional due process requirement for union mergers in response to the Supreme Court’s decision in
NLRB v. Financial Institution Employees of America, Local 1182 (Seattle-First),
Kravis has petitioned for review, and the Board has filed a cross-application for enforcement. We review the Board’s decision to determine whether its factual findings are supported by substantial evidence and whether the Board otherwise acted arbitrarily and capriciously.
See Beverly Health & Rehab. Servs., Inc. v. NLRB,
II
Kravis has raised a variety of arguments to justify its decision to stop using referrals from Local 623 after termination of the collective bargaining agreement in 2000.
To analyze Kravis’s arguments, we first review the statutory background. Section 8(a)(5) of the National Labor Relations Act makes it “an unfair labor practice for an employer ... to refuse to bargain collectively with the representatives of his employees.” 29 U.S.C. § 158(a)(5). Section 9(a) defines the term “representatives”: “Representatives designated or selected *1188 for the purposes of collective bargaining by the majority of the employees in a unit appropriate for such purposes, shall be the exclusive representatives of all the employees in such unit for the purposes of collective bargaining in respect to rates of pay, wages, hours of employment, or other conditions of employment.” 29 U.S.C. § 159(a).
A union can achieve the status of a majority collective bargaining representative through either Board certification or voluntary recognition by the employer — in a contract, for example.
See Exxel/Atmos, Inc. v. NLRB,
When a collective bargaining agreement expires, an employer is ordinarily obligated to continue bargaining with the union, absent a showing that the union no longer has majority support.
See Auciello,
A
In this Court, Kravis argues that Local 623 was not a § 9(a) union because it was not the exclusive representative of stagehand employees at Kravis’s Dreyfoos Hall. If this were correct, Kravis would have had no obligation after 2000 to bargain with Local 623 regarding employment at Dreyfoos Hall. But Kravis’s contention flouts the plain language of the 1992 and 1998 collective bargaining agreements. In both contracts, Article I’s jurisdiction clause and Article II clearly provided that Kravis would
exclusively
use Local 623 referrals as stagehand workers at Drey-foos Hall. Article I defined the union’s work jurisdiction as “All carpentry, electrical, sewing, fitting, and related work performed on or in connection with the sets and props, costumes and wardrobe used in the Theater.” Article II provided that the Kravis Center “agrees that the work described in ARTICLE I above shall be performed by qualified workers referred by the Union.” Both contracts thus explicitly stipulated that all Dreyfoos Hall stagehands within the prescribed categories were to be referred by Local 623 — and would be subject to the terms and conditions negotiated by Kravis and Local 623 in the collective bargaining agreement.
See Strand Theatre of Shreveport Corp. v. NLRB,
Kravis also cites NLRA § 8(f), which provides an exception for employers in the construction industry to the usual rule requiring continued bargaining at the end of a contract. 29 U.S.C. § 158(f). But § 8(f) is a narrow statutory exception carved out for employers in the construction industry only.
See M & M Backhoe Serv., Inc. v. NLRB,
For those reasons, the Board reasonably concluded that Local 623 was a § 9(a) union and was the exclusive representative of stagehand employees at Dreyfoos Hall.
B
Having upheld the Board’s conclusion that Local 623 was a valid § 9(a) union and that Local 623’s presumption of majority support therefore continued to apply as of 2000, we next consider Kravis’s argument that it rebutted the presumption of majority support. Kravis contends, in particular, that it demonstrated a good-faith reasonable doubt about Local 623’s continued majority support, consistent with
Allentown Mack Sales & Serv. v. NLRB,
To sustain its good-faith doubt argument despite the lack of evidence, Kra-vis creatively contends that the union never had majority support at the time of the 1992 or 1998 agreements. To the extent Kravis is questioning the union’s original majority status, that argument is time-barred by NLRA § 10(b). 29 U.S.C. § 160(b). The case law interpreting Section 10(b) requires that any challenge to the initial majority status of a union be made within six months of recognition by
*1190
the Board or the employer.
See Local Lodge No. 1424 v. NLRB,
To the extent Kravis is raising this point in a circuitous effort to prop up its claim of good-faith doubt about the union’s majority support in 2000, it is entirely unavailing. Kravis had the burden to show good-faith doubt as to the union’s continued majority support in 2000. Raising a time-barred argument about an alleged lack of majority support in 1992 or 1998 does not alone suffice to meet Kra-vis’s burden to show its doubt about Local 623’s lack of majority support in 2000.
In short, the Board reasonably concluded that Kravis “was not privileged to withdraw recognition from Local 623 without demonstrating a good-faith reasonable doubt or uncertainty as to the Union’s support among employees. Because [Kra-vis] failed to meet this burden, the withdrawal of recognition was unlawful.”
C
Kravis argues that, even if it had an obligation to recognize and bargain with Local 623, it did not violate NLRA §§ 8(a)(5) and 8(a)(1) because it did not unilaterally change the scope of the bargaining unit at impasse. Changes in the scope of the bargaining unit may not be implemented unilaterally.
Boise Cascade,
Ill
Kravis contends that, contrary to the Board’s determination, any obligation it otherwise had to bargain with Local 623 ceased upon Local 623’s merger with other unions to form Local 500.
In cases involving union mergers or affiliations, the Board traditionally had required an employer to continue bargaining with a union (i) if the union merger or affiliation was conducted by a vote with adequate due process safeguards, and (ii) if the organizational changes were not so dramatic that the post-merger entity lacked substantial continuity with the preexisting entity.
See Sullivan Bros. Printers Inc.,
In the decision in this case, however, the Board expressly overruled its precedent and jettisoned the first factor in light of the Supreme Court’s decision in
NLRB v. Financial Institution Employees Local 1182 (Seattle-First),
*1191
In this case, the Board reasonably concluded that Seattle-First’s rationale applied to a merger. As the Board reasonably determined, when there is “substantial continuity” between the pre-merger and post-merger union, the lack of a membership vote on the merger does not cast doubt on employee support for the union because the union is “largely unchanged.”
Kravis, “as the party seeking ... displacement, has the burden of proving its claim of discontinuity.”
News/Sun Sentinel Co. v. NLRB,
Substantial evidence supports the Board’s finding that the changes were not “so great that a new organization” came into being.
We deny the petition for review and grant the Board’s cross-application for enforcement.
So ordered.
Notes
. The Board has since modified the
Allentown Mack
standard so that reasonable doubt of a union's majority status is no longer sufficient to justify an employer’s unilateral withdrawal of recognition. Now, the Board requires an actual showing that the union no longer has majority support.
See Levitz Furniture Co.,
