[cgb223]

OP here

Obviously the above and below situations are hypothetical. I am currently between jobs, and have never been an employer.

Let's imagine I was aware that a coworker is an illegal immigrant. Do I have any obligation to take some kind of action?

Would it make a difference if one of the C-level employees was the illegal immigrant?

[blorsh]

If your non-action could be construed as sheltering/encouraging/aiding the illegal alien with employed in the USA, you're committing a felony. Other coworkers could of course report you for that felony. Here:

http://www.fairus.org/issue/the-law-against-hiring-or-harbor...