The highly publicized 2008 Immigration & Customs Enforcement (ICE) worksite raid in Postville, Iowa, signaled a new strategy in interior immigration enforcement. Rather than merely deport the unauthorized workers it apprehended, ICE arrested them on charges of working under stolen documents (aggravated identity theft) and invented Social Security numbers (Social Security fraud) and imprisoned them prior to their deportation. Drawing on interviews with forty‐five migrant farmworkers and six labor supervisors in a migrant farmworking community in California's Central Valley, this article explores how unauthorized migrants obtain the work documents they must provide to labor supervisors in order to work. This article shows that the poverty and marginalization of migrant communities has led to the mutually beneficial exchange of work authorization documents between donors with legal status and recipients without legal status. Using ethnography to recontextualize these document loans, this article offers an alternative interpretation of the criminal charges levied in Postville. Because voluntary document exchanges may be misrepresented as involuntary theft, labor supervisors use their knowledge of identity loan to suppress identity recipients’ workers’ compensation claims. This article examines the effect of the criminalization of immigration on labor discipline, suggests that migrant “denounce‐ability” has joined migrant “deportability” as a powerful new tool of labor subordination.