Most likely they were all illegals.
No problem, Biden won’t deport them and they’re eligible for every form of American welfare.
My wife's late cousin, years ago, told us how good they were at hiding the illegals when an unannounced raid happened. They had fake walls and all sorts of ways to move them around the facilities ahead of searchers. He was a supervisor at Tip-Top Poultry and travelled around between facilities across North Georgia.