"Could it be unions are better than industry or government at policing illegals in the work force ?"
In general, yes. Although union leaders are now becoming Aztlan-heads, because some of them are members of those kind of groups. The workers are anti-illegal.
I'm curious where some of these dissolutioned union workers will go. The green party is full of socialists, and the dems are increasingly pro-open border. I doubt many of them will go repub or conservative. We're in odd times. It seems like the wedge is really coming out in the open.
Many of those 'disillusioned union workers' are actually good, solid Archie Bunker and Joe Six-pack types. Not too much of a stretch for them to go conservative. Many are waking up to the fact that the Dems and their leaders have ties to gun-grabbing commie pukes, and voting Pubbie.