The United States Immigration and Customs Enforcement (ICE) is a federal law enforcement agency under the United States Department of Homeland Security. Its stated mission is to conduct criminal investigations, enforce immigration laws, preserve national security, and protect public safety. ICE was created as part of the Homeland Security Act of 2002 following the September 11 attacks. It absorbed the prior functions of the Immigration and Naturalization Service and the United States Customs Service.
ICE has two primary and distinct law enforcement components: Homeland Security Investigations (HSI) and Enforcement and Removal Operations (ERO).