Earlier quoted context omitted.
Probably none [edit: in manufacturing]. Most illegal immigrants don’t work manufacturing. The three most common jobs for illegals around here are construction, yardcare, and building cleaning via nested subcontractors. Manufactures have hard assets they could loose. Sketchy subcontractors can just disappear and rename. The growth is from the demand side - people are buying more right now.
You forgot about food production - both farming and things like meat packing or food manufacturing
Most traditional manufacturing jobs require being able to read/write the native language. Also, manufacturing companies are sometimes audited by standard bodies that involve interviews with workers (mainly to see if they understand quality control).