Employers who acquire unionized businesses just gained a new tool, and a reminder that the ground under federal labor law is shifting fast. On July 21, 2026, the U.S. Court of Appeals for the D.C. Circuit issued its decision in Hospital Menonita de Guayama, Inc. v. NLRB, refusing to enforce the National Labor Relations Board’s longstanding successor bar doctrine. The court held that the Board exceeded its statutory authority under the National Labor Relations Act by creating a rule that shielded an incumbent union from any challenge to its majority support for up to a year after a business changed hands.
The decision is one of the first major post-Loper Bright rulings to strike down an established NLRB doctrine, and it signals that courts are increasingly willing to test Board-created rules against the actual text of the National Labor Relations Act rather than defer to the Board’s policy judgment. Here is what employers need to know.
What Was the Successor Bar Doctrine?
Under the Supreme Court’s decision in NLRB v. Burns International Security Services, a company that acquires a unionized business can become a successor employer and, in many cases, must recognize and bargain with the incumbent union if a majority of its workforce came from the predecessor. That successorship obligation is not what the D.C. Circuit struck down.
The successor bar was a separate doctrine the Board created and re-adopted in its 2011 decision in UGL-UNICCO Service Co. It barred the successor...
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