A November ruling by the National Labor Relations Board also banned mandatory captive audience meetings.

“Ensuring that workers can make a truly free choice about whether they want union representation is one of the fundamental goals of the National Labor Relations Act,” Democratic chair of the board, Lauren McFerran, said in a statement about the decision.

That doesn’t mean that labor relations are free of conflict: Early in December, the Teamsters union filed unfair labor practice charges with the National Labor Relations Board against the company for what it called the company’s “calculated effort to undermine workers’ rights and disrupt the collective bargaining process.”

But the Teamsters have not held formal union elections, and the proposed bargaining units at these facilities have not been recognized by the National Labor Relations Board, which has the authority to order Amazon to come to the bargaining table.

Amazon spokesperson Kelly Nantel accused the Teamsters of falsely presenting their union as formally representing many of the Amazon employees and subcontracted drivers since they had not completed the process for recognition by the National Labor Relations Board.