NLRB Successor Bar Under Fire: What Employers Buying Unionized Businesses Need to Know

Employers acquiring a business with a unionized workforce may soon have more flexibility to challenge the incumbent union’s status than they have had for decades. On July 21, the D.C. Circuit held in Hospital Menonita de Guayama, Inc. v. NLRB that the National Relations Labor Board (NLRB ) never had the authority to impose its “successor bar” doctrine, a rule that generally requires a successor employer to continue bargaining with an existing union for up to a year after an acquisition. As one of the first appellate decisions to reject an NLRB doctrine since the U.S. Supreme Court ended automatic deference to federal agencies, other doctrines built on similarly thin statutory footing may be next.

For now, however, employers should not assume their obligations have changed. The NLRB continues to apply the successor bar and employers that withdraw recognition based solely on this decision could still face unfair labor practice charges while the issue continues to be litigated.

D.C. Circuit Rejects the NLRB’s Successor Bar Doctrine

The NLRB’s successor bar doctrine prevents a new owner of a unionized business from challenging the incumbent union. The employer must continue bargaining with it for up to one year no matter what employees are saying.

In Hospital Menonita, a hospital acquired a unionized facility and later received evidence that employees in every one of its bargaining units no longer supported the union. It withdrew recognition. The Board, applying the successor bar, found a violation. The D.C. Circuit disagreed. Compelling an employer to bargain with a union that may lack majority support, it held, collides with sections 7 and 9 of the National Labor Relations Act, the provisions that protect employees’ right to choose their own representative.

Importantly, the successor bar is still the law at the Board and it stays that way until the Board abandons it or the Supreme Court weighs in. An employer that withdraws recognition today on the strength of this ruling is volunteering to be the test case.

The Broader Impact on NLRB Doctrine

For years, courts reviewing Board doctrine gave the agency the benefit of the doubt. The Supreme Court ended that in 2024 with Loper Bright Enterprises v. Raimondo, holding that courts—not agencies—are responsible for determining the best reading of federal statutes.

Hospital Menonita highlights the impact Loper Bright has made. The D.C. Circuit previously upheld the successor bar, but after the Supreme Court vacated that decision and sent the case back to be reconsidered under Loper Bright, the successor bar did not survive.  

Every reviewable Board order can be appealed to the D.C. Circuit. As a result, this decision may provide a roadmap for future challenges to Board-created doctrines. Change will come one case at a time, but it has started.

What This Means for Employers

Nothing changes today. But if an acquisition involving a unionized workforce is on the horizon, put the successor bar into your deal timing and strategy now. Document what employees actually say about the union instead of relying on impressions, and do not withdraw recognition without counsel. This is a development to watch, not a green light.