I hope this investigation goes higher up the corporate ladder, but it seems to me this is a decent start:
Two supervisors at an Iowa meatpacking plant that was raided by federal immigration agents in May were arrested and charged with encouraging people to live in the United States illegally.
Juan Carlos Guerrero-Espinoza, 35, and Martin De La Rosa-Loera, 43, were also charged Thursday with and aiding and abetting the possession and use of fraudulent identification. source >>>

This is a good start, but I too hope they go higher in the corporate offices, for arrests…….MTA