And that is not an excuse.
The fact is they undercut the wages in any given area to the detriment of the community at large. Another nail in the coffin of the middle class.
I could invite my English friend over to work, and it wouldn't get away with it. I wonder if could stay in the US indefinitely if she would travel to Mexico and saunter across the border. She sure can't do it legally except on a tourist visa and at great expense.
Arf