Amazon drivers at the DIL7 delivery station in Skokie, Illinois, struck on June 26 over the company’s violations of federal labor laws.

A hundred drivers have organized with Teamsters Local 705 and are demanding that Amazon recognize and bargain with their union, after presenting cards signed by a majority of the workforce.

They’re nominally employed by a contractor, Four Star Express Delivery. But “every Amazon driver knows who our true employer is,” said driver Luke Cianciotto in a union statement. “We wear their uniforms and drive their trucks.”