Amazon delivery drivers and Starbucks baristas are on strike in a handful of U.S. cities as they seek to exert pressure on the two major companies to recognize them as unionized employees or to meet demands for an inaugural

Amazon warehouse workers in San Francisco and six other facilities around the nation went out on strike Thursday to try to force the e-commerce giant to negotiate with them.

Coordinated strikes ahead of Christmas in a handful of cities including San Francisco and New York see the Teamsters challenge the nation’s second-largest private employer.

Amazon has a couple hundred employees at each delivery station. The Teamsters mainly have focused on organizing delivery drivers, who work for contractors that handle package deliveries for the company. But Amazon has rebuffed demands to come to the negotiating table since it doesn’t consider the drivers to be its employees.

Workers at Amazon fulfillment centers in Palmdale, Industry, Victorville and San Francisco joined a strike led by the Teamsters sweeping several warehouses across the country.

Workers at an Amazon warehouse in San Francisco are on strike Thursday, joining six other delivery stations of the e-commerce company across the country. The Teamsters, who are seeking a labor agreement during a key shopping period,

Workers in Staten Island joined in a series of strikes led by the Teamsters that began on Thursday. Amazon said its operations won’t be significantly affected.