The National Labor Relations Board ruled that employers can’t force workers to listen to anti-union speeches, but a Trump board could reverse the decision.

Employers can still hold meetings to express their views on unionization, but must now give workers advance notice and make clear they are voluntary.

Amazon.com made unlawful promises and threats during mandatory meetings to discourage unionizing at a New York City warehouse, a U.S. labor board said on Wednesday while banning employers from holding such meetings moving forward.

The National Labor Relations Board has ruled it is illegal to force union-backing employees to attend meetings held by their companies that are designed to undermine support and argue against the labor groups.

The Biden administration's National Labor Relations Board issued an opinion on Wednesday that bars businesses from expressing their views on unionization to a "captive audience" of employees.

After a lengthy consideration, the National Labor Relations Board has ruled that Amazon’s “captive-audience meetings” are a violation of the National Labor Relations Act.

The ruling, stemming from a complaint against Amazon, bars companies from compelling workers to attend meetings on unionization’s downsides.