If Your Are An H4 Visa Holder, How Can They (immigration) Catch You Working If Your Employer Pays You Cash Or If They Caught You Working What's Going to Happen Next?

From my experience, in many cases, one of co-workers reported to immigration, so both were arrested and this happened very often. Penalty for the felony offense of harboring illegal aliens is up to 10 years in federal prison.

For H-4 holder, violation of immigration laws = deportation + jeopardized H-1B status.