The Starbucks baristas strike is spreading to more cities — and the union organizing the workers warned the walkout would affect hundreds of stores on Christmas Eve, the last day of the five-day walkout.

Workers at Starbucks locations in the metro area and Duluth have joined a nationwide strike. Starbucks Workers United — which represents workers at more than 500 stores across the country — recently authorized an unfair labor practices strike, with workers walking off the job on Christmas Eve.