Texas-based Pilgrim's Pride puts the number of workers arrested at 400 hourly, non-management employees in plants in Texas, Florida, Tennessee, West Virginia and Arkansas.
In a separate operation, federal authorities also arrested dozens of workers at a doughnut factory in Houston and the operators of a chain of Mexican restaurants in upstate New York.
No criminal or civil charges have been filed against Pilgrim's Pride, which has about 55,000 employees at facilities mostly across the South and in Mexico and Puerto Rico.
