Discount giant Wal-Mart Stores Inc. is facing a lawsuit seeking class-action status for temporary workers who claim the retailer and its staffing agencies violated federal overtime and minimum-wage laws.

Filed in the U.S. District Court of Illinois, the suit accuses the world’s largest retailer of requiring employees to work during meals and breaks and to show up early and stay late without pay.

The suit alleges that Wal-Mart did not accurately keep records of how much time workers put in. The discounter is also accused of neglecting to compensate temporary workers for a minimum of four hours of work on days they were assigned to a store but then worked less than four hours, violating Illinois labor laws.