The union Workers United has organized roughly 400 stores, but is locked in a bitter bargaining fight with the coffee chain.

Federal labor prosecutors have accused Starbucks of illegally firing union supporters, making unlawful threats and refusing to bargain with workers throughout the campaign. Labor board judges have ruled against Starbucks again and again, finding the company violated the law in 48 of 49 cases that have been heard so far, according to a tally provided by an NLRB spokesperson.