 On October 23, 2003, federal agents raided 61 Walmart stores in 21 United States states in a crackdown known as "Operation Rollback", resulting in the arrests of 250 nightshift janitors who were undocumented.Following the arrests, a grand jury convened to consider charging Walmart executives with labor racketeering crimes for knowingly allowing undocumented workers to work at their stores.The workers themselves were employed by agencies Walmart contracted with for cleaning services.