Okay Z-man, I'll tell ya' how this little scam works, but first we'll talk the politics of it all. Now I get it, the dems ignore the issue so they can have that Hispanic voting block which they desperately need to contend. Simple enough. The repub establishment turns a blind eye and gives lip service, but they just love the slave labor and suppressed wages. Simple enough as well. This is why nothing of substance gets done, or will get done, even with a Trump presidency. A fucking wall is a joke. Even if it gets built is some fashion it won't make a dent.
Now lets get to just how this job scam works. We're talking about small to mid sized manufactures and industrial type service companies and contractors. The ones that employ a large majority of illegals don't employ them directly, they use temp services. The employer is protected by the agreement with the temp service who claims to use e-verify. When you see a company who has the majority of their workforce being supplied by industrial type temp services you have it. You can also find them simply enough by looking at their help wanted ads for supervision. Must be bilingual is mandatory. No habla espanol, no job. That person will be the only person on the shop floor who speaks english.
If these bastards that run this country really wanted to solve the illegal immigration problem all they have to do is start enforcing labor law. They won't because of the already stated politics of it all. You lefties can pretend all you like that the party represents the working man, but your actual polices screw the American worker every step of the way. When it comes to blue collar labor there is zero difference between the dem establishment and repub establishment. None at all. Just because the white plantation owners hire a couple house niggers doesn't fool anyone with a brain.