From The Globe and Mail: The thumping sound of helicopters overhead signalled to everyone in Postville, Iowa, that the town's 20-year bargain with illegal immigration was about to end. With military precision last week, federal investigators led by U.S. Immigration and Customs Enforcement descended on the town's largest employer, Agriprocessors kosher slaughterhouse, with warrants for the arrest of nearly one-third of the town's 2,400 residents. In the largest immigration raid in U.S. history, 389 people were arrested in a matter of minutes, herded onto buses and interned at the National Cattle Congress Fairgrounds, 120 kilometres away in Waterloo.