The union is aiming to pressure the online retailer by threatening delays in package deliveries during the critical holiday season.

Teamsters union says Amazon workers at seven warehouses plan to walk off the job Thursday morning in multiple states.

With Christmas two days away, workers at four Amazon warehouses in Southern California are on strike Monday on claims the corporate giant refuses to recognize their union and negotiate fair contracts.

The Staten Island Amazon facility, known as JFK8, employs more than 5,000 workers, and about 100 of them joined the picket line early Saturday.

Amazon workers at four California facilities will join their striking colleagues on the picket line Thursday morning after reaching a stalemate during labor negotiations.

Bundled up and huddled around propane and diesel heaters, the group appeared upbeat and optimistic as strike organizers provided them with hats, jackets, hand warmers, beverages and snacks.

The Teamsters said the strike will begin Thursday at several facilities, including in New York City, Atlanta, California and Illinois.

The International Brotherhood of Teamsters said workers at seven Amazon facilities will begin a strike on Thursday morning.

Workers describe tens of thousands of packages delayed—and a strong sense of empowerment within warehouses—after Amazon workers with the Teamsters launched the largest strike to date against one of the world's most powerful companies.

Amazon and Starbucks workers strike for union recognition and better working conditions. Labor leaders prepare for potential rollback of worker protections under Trump administration. California unions seek state-level safeguards against weakening federal labor regulations.

Striking Amazon and Starbucks workers in California and elsewhere have long pushed for union contracts. The Trump administration is unlikely to be on their side.