The are laws — large fines against companies who employ illegals. Enforce those first. Then enforce if they hire a company that hires illegals.
For example Home Depot is very strick about not hiring illegals. But they hire a cleaning company that uses illegals completely.
Go after the cleaning companies!!
Yep, they always get away with farming it out to sub contractors. Heck, most drywallers, painters, etc in construction are illegals anymore.
We are in a bad way in this country right now. Our youngsters are learning nothing, have no jobs and are doing dope. I see it around me every day.