Starbucks workers at more than 100 U.S. stores are on strike Thursday in their largest labor action since a campaign to unionize the company’s stores began late last year.

The walkouts coincide with Starbucks’ annual Red Cup Day, when the company gives free reusable cups to customers who order a holiday drink. Workers say it’s often one of the busiest days of the year. Starbucks declined to say how many red cups it plans to distribute.

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