The company's decision to close a store in Ithaca, New York, has prompted the workers' union to accuse the company of retaliation.
The National Labor Relations Board received the complaint on Friday.
Reggie Borges, a Starbucks spokesman, told Insider that the store was closed due to facilities, staffing, and time and attendance issues.
We open and close stores on a daily basis. The kind of store environment that partners and customers expect of Starbucks is constantly being created.
According to the report, Alan Model, an attorney for Starbucks, sent an email to the union to inform them of the store's impending closing.
Evan said that Starbucks wouldn't get away with retaliating against them. We will persist whatever it takes.
More than 50 Starbucks and three Ithaca stores have voted to unionize in the last few months.
Apple workers who tried to unionize in April withdrew their request after being intimidated.
Amazon's first unionized warehouse was a surprise win.
The Ithaca store employees voted to unionize in April. The grease trap overflowed and spilled grease and oil onto the floor.
Starbucks workers have been helped to unionize by Workers United, a union that supports the staff.
Gary Bonadonna, a regional leader for the union, said that the closing was an act of war against their members.