The Backgrounder , " Taking Back the Streets : ICE and Local Law Enforcement Target Immigrant Gangs , " by Jessica M. Vaughan and Jon D. Feere , was funded by the Department of Justice and describes the unique public safety problems posed by immigrant gangs . The authors present previously unpublished statistics on gang arrests by Immigration and Customs Enforcement ( ICE ) , describe how immigration law enforcement authorities are used to combat gang activity , and offer policy recommendations to improve federal-local cooperation without damaging relations with immigrant communities .