Will the Immigration Crackdown Work?

Employers of Illegal Immigrants cry that illegals are the only workers they can get to work for $10 an hour. CNN recently posted a story on their website interviewing employers that actually go to Mexico to recruit workers. This is an insane practice. Did these employers ever consider going to areas of the United States with high unemployment and attempt to recruit workers to relocate to their area for work? I doubt it for one reason. What they don't talk about is how they can exercise unfair labor practices on the illegals that they know they can't get away with on legal workers. The illegals aren't going to complain out of fear of being detected and deported back to Mexico.
The article went on to explain how the Internal Revenue Service only contacts employers if they file 10 or more illegal W-2 forms. Does this mean that if an employer only hires 9 illegal workers, he can operate forever without detection?
I think it's time for the crackdown to get stronger!