The UAW broke its pledge to cease organizing activity at the Chattanooga auto plant that rejected unionization, announcing on Thursday afternoon that it would form a voluntary union for factory workers.

The union signed a neutrality agreement with the German auto manufacturer that gave organizers an advantage during its campaign.

However, that agreement also contained a provision barring the union from any organizing activity for one year following the vote.

The union decided to break that pledge on Thursday, announcing the formation of a new local that would allow workers to join voluntarily.

Who can trust a union’s promise?