From this:

A former union representative who helped illegal workers get jobs at a Swift & Co. meatpacking plant in Marshalltown was found guilty of federal immigration charges today.

A jury found Braulio Pereyra-Gabino guilty of harboring illegal immigrants but acquitted him on other charges that included false use of a Social Security number and aggravated identity theft.

...Pereyra-Gabino was working as vice president of Local 1149 of the United Food and Commercial Workers union when he was arrested by federal immigration officials in July 2007.

Prosecutors contend that he told undocumented workers how to escape detection and protect their fake identities used to get jobs at the Marshalltown plant.

What he said during his "orientation speeches" at the link; note that a former Swift manager was sentenced to a year's probation, probably ruling out him dropping a dime on higher ups. And, perhaps that was by design.

More in UFCW, Mexico-linked Peter Schey sue DHS over immigration raids (4th Amendment, yeah sure).