Can employers force workers to sit through a meeting where its (critical) views of unionization are presented to dissuade them from joining a

The National Labor Relations Board announced a new ban on mandatory captive-audience meetings aimed at discouraging employees from unionizing.

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

The National Labor Relations Board ruled yesterday that "captive audience" meetings are illegal. Employers may not require workers to attend presentations that explain to them the company's position on whether they should not join or form unions.