The last large raids were in 2006 at Swift Meat packing. What set them off was an internal investigation of a Hispanic worker in ICE who the IRS was complaining had not been paying income tax. Due to identity theft, her name & SSN were being used at more than 50 simultaneous jobs. Apparently the financial motive for a lot of identity theft is to find Hispanic name & SSN combos, which were, at least back in 2006, worth over $50 each to companies looking to dodge eVerify checks.