Many of them get big IRS refunds  after paying ZERO federal income tax.  For the refundable Child Tax Credit ($1,000 per head) they claim children who live in Mexico.   

Many others are paid under the table.  Ever wonder why so many yard maintenance workers are Mexican?  Si senora, they take your check to your bank and cash it, tax free.

That makes it a DOUBLE hit on our economy.  Sending tax free money back to Mexico.   Wish I could support my family with tax-free income.