Are they in Southern California? Then YES, they do. But don't be so quick to blame the employers -- the market is so saturated with illegals that if you hire large numbers of people you almost can't help it.
It's like trying to boycott China in a toy, shoe, or hardware store -- many of the tools and darn-near ALL toys and shoes are made in China, so you don't really have a choice. Ditto for hiring illegals, at least around here.
Here in Iowa, not long after a new meat-packing plant opened, the surrounding area was inundated with people of the Mexican persuasion. That makes a lot of people uneasy; some are downright angry. Crime allegedly went up. (Double the size of any small town in a year, and realistically, it couldn't go any other direction, regardless of whether the newcomers were Mexicans or Mormons!)
Now, make no mistake, I'm as anti-illegal alien as anyone. But, I'm just wondering, am I supposed to "red-list" the plant because there's a bunch of new people in town who don't look like the rest of us? Or, how does one go about determining whether the plant hires illegals?