No, they don't. Because businesses would complain to high heaven if they did.
The reality is we are ALL complicate in undocumented immigration. We all benefit for the low-cost labor they provide.
It's not just the big business employer that knowingly hires illegals.
It's the suburban home owner who hires a bunch of day-laborers outside the Home Depot after that DIY project turned out to be harder than Chip and Joanna made it look.
it's the restaurant owner who hires them because white teenagers are too spoiled to work cleaning tables like I did when I was 17.
It's the rich professional who hires illegals to clean their houses and raise their kids, and they think of Lupe as just like one of the family, which is why they aren't paying her taxes.
Here's how I would fix the illegal problem.
1) Create Guest Worker Visas for unskilled labor based on business demand. You only get to offer an GWV if you can show that you can't hire an American at a reasonable wage.
2) Strictly enforce the law against employers who routinely violate the law. Offer rewards for reporting employers who do so.
Give us a few specific examples of "BIG Businesses hiring illegals"
Do you have any evidence that happens?
WHO owns / runs these big businesses you speak of? (I'll bet you a dollar that even if you find some examples, it's DEMOCRATS who own the businesses)
Or maybe you're making it up? Convenience.