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.

But the crackdown’s relatively high costs and limited results are also fueling criticism. In an economy with more than 6 million companies and 8 million unauthorized workers, the corporate enforcement effort is still dwarfed by the high-profile raids that have sentenced thousands of illegal immigrants to prison time and deportation.

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