The national bar association for immigration lawyers is calling on the Justice Department to drop charges against undocumented workers swept up in a raid on an Iowa meatpacking plant last year. Nearly 400 workers were detained at the Agriprocessors plant in Postville, Iowa, making it one of the largest raids in US history. On Tuesday, the American Immigration Lawyers Association said the charges should be dropped following this week’s Supreme Court ruling on identify theft. On Monday, the court ruled prosecutors must prove an undocumented worker knew false identity papers belonged to another real person.