Original: U.S. Immigration and Customs Enforcement (ICE) is a federal law enforcement agency under the United States Department of Homeland Security (DHS), responsible for identifying, investigating, and dismantling vulnerabilities regarding the nation's border, economic, transportation, and infrastructure security.
Simplified: U.S. Immigration and Customs Enforcement (ICE) is the largest and primary law enforcement agency of the United States Department of Homeland Security (DHS).