Starbucks Workers United, the union that has organized workers at 535 company-owned U.S. stores, said Starbucks has failed to honor a commitment made in February to reach a labor agreement.

Baristas at hundreds of Starbucks in California and elsewhere in the U.S. plan to strike in the days before Christmas as plans to negotiate a contract stall.

The walkouts in Los Angeles, Chicago and Seattle come after talks between the company and the workers’ union failed to produce an agreement on raises.