In a blow to the Teamsters and other unions, the National Labor Relations Board (NLRB) is overturning policies that made it easier for nonunion workers to organize.

On Friday, NLRB Acting General Counsel William Cowen started the process to end the ban on captive audience meetings during organizing drives. That ban was first won by workers in a case against Amazon.

Employers will once again be able to force workers into closed-door meetings meant to intimidate them out of unionizing. 

Cowen is also moving to have the Cemex decision overturned, which requires employers who commit unfair labor practices to bargain with the union. 

The Teamsters have used Cemex to claim bargaining rights at multiple Amazon locations.

For a summary of labor rights that will be weakened by the NLRB memorandum, read here.