Stands for Immigration and Customs Enforcement. Basically the people in charge of protecting the USA's borders. Also the subject of a lot of controversy.
wrong, ICE doesn't protect the borders, their sole purpose is deportation and immigration enforcement after people crossed the borders, and investigation of other immigration-related crimes
ICE has two primary components: Homeland Security Investigations (HSI) and Enforcement and Removal Operations (ERO). [...] ICE does not patrol American borders; rather, that role is performed by the United States Border Patrol, a unit of U.S. Customs and Border Protection, which is a sister agency of ICE.