U.S. Citizenship and Immigration Services (USCIS)
With the creation of the Department of Homeland Security (DHS) and the reorganization and streamlining of the functions of the executive branch relating to counter terrorism and the safety of the people of the United States, the DHS has administered the nation's immigration laws since March 1, 2003 when the Immigration and Naturalization Service (INS) became part of DHS. INS is later renamed the U.S. Citizenship and Immigration Services (USCIS).
Executive Office for Immigration Review (EOIR)
The Attorney General of the U.S. delegates authority to EOIR to administer and interpret federal immigration law and regulations through the conduct of immigration court proceedings, appellate reviews, and administrative hearings. There are three components:
Board of Immigration Appeals (BIA) hears appeals of decisions made in individual cases by Immigration Judges, DHS District Directors, or other immigration officials.