By Spencer S. Hsu - Washington Post Staff Writer

A three-year-old enforcement campaign against employers who knowingly hire illegal immigrants is increasingly resulting in arrests and criminal convictions, using evidence gathered by phone taps, undercover agents and prisoners who agree to serve as government witnesses. 

READ MORE:  http://www.washingtonpost.com/wp-dyn/
content/article/2008/07/20/AR2008072002293.html

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