Starbucks baristas went on strike at several stores in Chicago, Seattle and Los Angeles on Friday, with their union warning the walkouts could spread to hundreds of cafes by Christmas Eve if the coffee giant does not meet workers’ demands at the bargaining table.

Workers at some Starbucks stores started a five-day strike Friday in three U.S. cities, including Chicago, to protest lack of progress in contract negotiations with the company. S

On the heels of the Christmas rush, Starbucks union employees plan to strike in three states Friday citing issues over wages, benefits and staffing. A five-day strike is slated in Chicago, Seattle, and Los Angeles,