I first saw illegal immigrants when I was just a child but I didn't understand it. I later saw migrant workers in SC but still didn't understand the scope of the problem. Its true that these people have been coming here for decades and farms have been taking advantage of the cheap labor they offer all of which is illegal.
The Obama Administration did have some enforcement efforts on businesses that were hiring illegals instead of Americans but it hasn't been enough. Deliberately hiring an illegal to work in a factory that used to employ Americans should be addressed with hefty fines for breaking the law.
I believe that it has to be enough to stop it cold turkey and keep it that way.