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The strike — which began on Red Cup Day, historically one of Starbucks’ busiest sales days where customers can get a free reusable cup with their order — has already spread to dozens of stores nationwide.

The union has warned that the work stoppage could expand to more than 500 stores if negotiations continue to stall.

Sanders, a longtime champion of labor rights, voiced support for workers demanding stable schedules and a living wage.

Mamdani, who urged New Yorkers to boycott Starbucks during the strike last month, used the moment to reaffirm his intentions for the mayoralty.

In one photograph he shared on social media, he appeared to be holding a sign that read: “No contract, no Starbucks.”

Mamdani has highlighted the pay gap driving worker frustration.

In a post on X on Monday, he contrasted the company’s record executive compensation with what striking baristas say are basic demands for stability and respect.

“Starbucks CEO Brian Niccol made $95 million last year. His workers are striking for the bare minimum. Glad to be on the right side of the picket line with them,” Mamdani wrote.

In a press release announcing the city’s settlement, a Workers United union boss called it a “major victory.”

“It shows the power baristas have when we stand together and demand change,” Kai Fritz — a New York City Starbucks worker — said, which was also included in the press release. “We are continuing to fight back against Starbucks’ greed and will not stop until we have a fair contract that ensures the support and protections we need to thrive.”