Amazon workers are striking at one of the company's main aviation hubs on the west coast of Southern California

Amazon employees at a “critical” warehouse in the Inland Empire went on strike on Sunday.

The workers are on strike over unfair labor practices because they allegedly faced retaliation when they tried to form a union, according to a joint statement from the workers and the Teamsters union that is helping them organize the strike.

“The workers striking now have the full support of more than a million Teamsters across the country,” said Randy Korgan, director of the Teamsters’ Amazon division. “Amazon has no respect for the well-being of the workers who make its profits possible, and the workers in San Bernardino have sent a clear message to these white-collar criminals that they have had enough.”

The warehouse where the strike took place – the KSBD warehouse in San Bernardino – is Amazon’s largest air cargo warehouse on the West Coast. The strike came immediately after Prime Day, the marketplace’s incredibly popular 48-hour shopping event.

Prime Day 2024, which took place on July 16 and 17, was Amazon’s biggest ever, according to the company. This year’s event saw record sales and more items sold than any previous event. Millions of customers worldwide signed up for Amazon Prime in the three weeks leading up to Prime Day – also a record.

According to union officials, the KSBD warehouse is a “hotbed” for Amazon workers organizing with the Teamsters. Striking employees have led numerous walkouts and strikes against alleged unfair labor practices and have filed petitions for higher wages, heat protection and safer working conditions, among other priorities.

“Amazon is one of the most profitable companies in the world, but it consistently treats its workers like scum,” said Anna Ortega, an Amazon air cargo center worker who is organizing with the Teamsters. “We are standing up for our right to organize and fight for a better future at Amazon.”

“If Amazon wants revenge for our organizing, we’re going to take to the streets,” said Regina Herrmann, another air cargo worker organizing with the Teamsters. “Amazon workers are responsible for Amazon’s huge profits, especially on Prime Day… we are united and ready to exert our collective power.”

Elsewhere in Southern California, Amazon delivery drivers in Palmdale went on strike last November. In an op-ed published in Fortune magazine last November, one of the Palmdale delivery drivers, Cecilia Porter, called her job “extreme” and said the pressure from Amazon was “unprecedented.”

Further afield, a group of 104 Amazon drivers joined forces with the local Teamsters union in Skokie, Illinois, to demand the company refrain from anti-union tactics. The drivers there – who are employed by a different contractor – reportedly claim Amazon has retaliated against their efforts to unionize by terminating the contract with their contractor.

KTLA reached out to Amazon for comment on Sunday’s strike in San Bernardino, but there was no immediate response.