Is it in the scope of ICE's power to crack down on companies? Or is that power delegated to some different federal alphabet soup agency? Though I approve of such tactics, I have no idea what federal group should be popping people who employ illegals. And that, in and of itself, is one of the primary troubles with allowing our lovely federal overlords to grow so large.
ICE goes after them, but if they're charged criminally, DoJ handles that.