New York City Mayor-elect Zohran Mamdani and U.S. Sen. Bernie Sanders of Vermont joined dozens of striking Starbucks union baristas at a picket line in Gowanus on Dec. 1, calling on the company to return to the bargaining table and offer a fair contract.

Union members have been on an open-ended unfair labor practice strike since Nov. 13, making it the longest ULP strike in Starbucks history. Dubbed the “Red Cup Rebellion,” the strike escalated on Black Friday, Nov. 28, when hundreds of additional union baristas from 26 stores in nearly 20 cities joined about 2,000 Starbucks workers already on strike at 95 stores in 65 cities.

The 11,000-member Starbucks Workers United is protesting the company’s failure to finalize a union contract, calling for improved staffing levels, higher take-h

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