The union representing some Starbucks (SBUX) baristas announced that workers in 300 stores in the U.S. are now taking part in a strike against the biggest coffee chain.

Starbucks workers have expanded their strike to more cities and closed 59 stores across the U.S. as of Monday, the union said amid stalled negotiations.

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Starbucks workers have expanded their strike to four more US cities, including New York, the union representing over 10,000 baristas said late on Saturday.

At the time of this writing, Starbucks (SBUX -0.89%) has tumbled a painful 8.7% over the past week -- likely due to soaring Arabica coffee bean prices and a broader market sell-off.

Starbucks workers have expanded their strike to four more U.S. cities, including New York, the union representing over 10,000 baristas said late on Saturday.

"We are ready to continue negotiations to reach agreements," the company added. "We need the union to return to the table.

Starbucks baristas are striking in Los Angeles, Chicago and Seattle. Starbucks Workers United is pushing for better pay for baristas as it negotiates with the company.

Unions representing Starbucks Inc. (NASDAQ: SBUX) workers are about to hit the coffee shop giant with strikes in major cities.

The planned walkout in Los Angeles, Chicago and Seattle comes after talks between the company and the workers' union failed to produce an agreement on raises.

Starbucks' largest workers' union announced that it would strike in three major cities on Friday. The Starbucks Workers United union said that stores in Los Angeles, Chicago, and Seattle would part...

The workers' union representing more than 10,000 Starbucks baristas said that union members will go on strike in Los Angeles, Chicago, and Seattle on Friday morning.