Immigration is regulated by the federal government. The main source of statutory law is the Immigration and Nationality Act (INA), originally passed in 1952. For more than 60 years, the agency responsible for enforcing immigration law was the Immigration and Naturalization Service, an agency within the Department of Justice, headed by the U.S. Attorney General. After the terrorist attacks against the U.S. on September 11, 2001, the Homeland Security Act of 2002 abolished the INS and created the Department of Homeland Security (DHS). (Pub. L. No. 107-296, 116 Stat. 2135).
The Homeland Security Act transferred the primary responsibility for enforcing and administering immigration laws from the Attorney General to the Secretary of the DHS, and created three separate agencies within DHS to handle immigration functions: one to administer benefits and services (USCIS) and two to handle law enforcement functions (ICE and CBP). The Attorney General and the Department of Justice have retained some enforcement powers. Other federal agencies regulating immigration include the Department of Labor and the Department of State.
Office of Administrative Law Judges Law Library, Immigration Collection: Provides access to decisions from the Board of Alien Labor Certification Appeals (BALCA) and several other types of immigration-related decisions. Includes links to Judge's Benchbook: Alien Labor Certification, 2d ed., Dictionary of Occupational Titles, selected statutes and regulations, and agency contact information.