Workers at Starbucks stores plan to go on a five-day strike starting Friday to protest the lack of progress in contract negotiations with the company.

The strikes are scheduled to begin in Los Angeles, Chicago and Seattle and could spread to hundreds of stores across the country by Christmas Eve.

Starbucks Workers United, the union that has organized workers at 535 company-owned U.S. stores since 2021, said Starbucks has failed to honour a commitment made in February to reach a labour agreement this year. The union also wants the company to resolve outstanding legal issues, including hundreds of unfair labour practice charges that workers have filed with the National Labour Relations Board.