Amazon warehouses in Southern California are on strike less than a week before Christmas. The workers went on strike early Thursday morning, claiming Amazon refuses to recognize their union and negotiate fair contracts.

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. As part of a nationwide labor action organized by the Teamsters union — which the Teamsters called the largest-ever against Amazon — about 40 people picketed outside of the company’s facility at 749 Toland St.