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 labor contract.

Workers at Starbucks (NASDAQ:SBUX) stores on Friday began a five-day strike to protest the lack of progress in contract negotiations with the coffee chain. The walkouts came a day after the Teamsters union said workers at seven Amazon (NASDAQ:AMZN) delivery hubs would go on strike.

Less than a week before Christmas, Amazon and Starbucks employees are striking as their respective companies refuse to meet union demands.