The Antisocial Socialist

Hmm. I can't say I know about the situation in the U.S. well enough to predict that. I know that in Canada, non-status immigrants can be deported for joining a union, much to the chagrin of IWW Toronto.

I think at the point that immigrants have unionized and won decent concessions, they're likely no longer illegal. Others will keep fleeing to the U.S. as long as conditions in Mexico are as bad as they are, and employers will hire whoever's on the lowest rung.