How could they not know?
Again
You call them and try to get a loan they gonna check you out to the fullest. Check your tax returns, check your residency history, etc, etc.
But for an employee they just let them work, and don't feel the need to check her background or citizenship.
And that makes sense to you? Really?
And even if they didn't know. Since when is ignorance/incompetence a suitable defense?
They got your mind fukking broken. You will defend multimillion dollar companies while they shyt on your tax dollars while simultaneously chasing after poor people for the little scraps they finessed for themselves.