U.S. Citizenship and Immigration Services USCIS
On March 1, 2003, the responsibility for providing immigration-related services and benefits such as naturalization and work authorization were transferred from the Immigration and Naturalization Service (INS) to USCIS.
Executive Office for Immigration Review (EOIR)
The Attorney General of the United States 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.
Board of Immigration Appeals (BIA) hears appeals of decisions made in individual cases by Immigration Judges, DHS District Directors, or other immigration officials.