A Slippery Place in the U.S. Work Force
Some illegal immigrants who lost jobs here, mostly workers with families back home, have left the country. Most are determined to stay. Employers, wary of immigration agents, now insist workers have valid Social Security numbers. Mr. López, who does not have one, said, “Without the number, you are nothing in this country.”http://www.nytimes.com/2009/03/22/us/22immig.html?_r=1