These companies (that rely heavily on undocumented labor, like slaughterhouses) are also
way too friendly with USCIS/ICE/DHS.
There was a coordinated series of raids on I believe Tyson a few years. A few facilities in a couple of counties.
Eight hundred, nine hundred undocumented workers.
Many of them said that the company advised them on staying under the radar. Some even gave the arresting officers company paperwork that told them how to do certain things, like fill out their I-9s, etc.
A curious journalist asked at the press conference where chests were being puffed about such things and the fact that the company was obviously not just aware, but assisting in the employment of these workers. "Are there any plans to investigate the company or issue fines or charges?"
"We are not considering that at this time."
Huh, color me surprised.
With all the labor law issues that these places have, from OSHA to child labor, it wouldn't remotely surprise me that if the undocumented workers get a little too "uppity" about health and safety or worker's rights, someone from the company calls ICE and says "Hey, we'll help you find a whole bunch of undocumented workers at our facilities if you don't consider enforcement against us".
It already IS a federal crime to hire undocumented workers, and an additional federal crime to harbor them at your place of employment (8 USC 1324). But almost never enforced, for some odd reason...