Two security officers who work on the Amazon campus in Seattle say their hours were cut after they marched to the company's headquarters on May Day.
The Service Employees International Union filed a complaint Wednesday to the National Labor Relations Board on behalf of Abdinasir Elmi and Betiel Desta.
Elmi and Desta are employed by Security Industry Specialists, a California-based company that contracts with Amazon.
"This problem has been going on for a long, long time. This is not the first time," Elmi said.