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.

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.

The Amazon workers who walked off the job at warehouses across the country at peak season are trying to establish a union beachhead against one of the most important — and most anti-union — employers in the world.

Union organizers have called an end to a five-day strike against Amazon by about 100 Atlanta drivers who joined other workers around the country