Race discrimination litigation against FedEx Express grew exponentially this week when a federal judge granted class certification to thousands of workers at the shipping company.

U.S. District Judge Susan Illston is allowing “thousands” of African-American and Latino hourly workers and “hundreds” of lower-level African-American managers in the company’s western region to move forward with claims that FedEx Express hasn’t played fair with pay, discipline and, in some cases, promotions.