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... The National Labor Relations Board said that so-called "captive audience meetings," which have been legal for decades and are routine during union campaigns, illegally interfere with workers' rights to freely choose whether or not to unionize.

Employers can lawfully hold meetings to discuss unionizing if they are voluntary, workers are given advance notice of subjects to be discussed, and no attendance records are kept, said the board, whose members are appointed by the president. The board currently has a majority of Democratic appointees.

The NLRB said that Amazon managers solicited grievances and made implied promises to remedy them if workers rejected the union during mandatory meetings at the Staten Island warehouse known as JFK8 ahead of a 2022 union election. At other meetings, managers illegally threatened to withhold raises and benefits if the warehouse unionized, according to the decision.

Amazon also removed union-related posts on an internet message board and threatened to discipline a JFK8 employee if she re-posted them, the board found. ...

The decision could also be overturned by the board when it gains a Republican majority, as the agency often reverses itself after changes in leadership. President-elect Donald Trump could have a Republican-led board in place as soon as next year. ...