United States Department of Justice has subsidiary Federal Bureau of Investigation
United States Marshals Service (USMS) – The office of U.S. Marshal was established by the Judiciary Act of 1789. The U.S. Marshals Service was established as an agency in 1969, and it was elevated to full bureau status under the Justice Department in 1974.
Federal Bureau of Investigation (FBI) – On July 26, 1908, a small investigative force was created within the Justice Department under Attorney General Charles Bonaparte. The following year, this force was officially named the Bureau of Investigation by Attorney General George W. Wickersham. In 1935, the bureau adopted its current name.
Federal Bureau of Prisons (BOP) – the Three Prisons Act of 1891 created the federal prison system. Congress created the Federal Bureau of Prisons in 1930 by Pub. L. No. 71–218, 46 Stat. 325, signed into law by President Hoover on May 14, 1930.
National Institute of Corrections (NIC) – Founded in 1974, the National Institute of Corrections is organized under the Federal Bureau of Prisons and has a legislatively mandated mission to assist state and local correctional institutions, and to manage the American Federal Prison System by keeping records of inmates.
Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF) – Except for a brief period during Prohibition, ATF's predecessor bureaus were part of the Department of the Treasury for more than two hundred years. ATF was first established by Department of Treasury Order No. 221, effective July 1, 1972; this order "transferred the functions, powers, and duties arising under laws relating to alcohol, tobacco, firearms, and explosives from the Internal Revenue Service to ATF. In 2003, under the terms of the Homeland Security Act, ATF was split into two agencies – the new Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF) was transferred to the Department of Justice, while the Alcohol and Tobacco Tax and Trade Bureau (TTB) was retained by the Department of the Treasury.
Drug Enforcement Administration (DEA) – Created in 1973 as part of the war on drugs, the DEA was formed from various previously existing law enforcement agencies that were parts of either the Department of Justice, Department of the Treasury or the Food and Drug Administration. The DEA enforces the Controlled Substances Act and also interdicts foreign drug trafficking.
Office of the Inspector General (OIG) – The Office of Inspector General performs basic internal auditing functions, and has the power to make arrests and prosecute members of the Department of Justice who are found to be in violation of laws regulating conduct of government officials.
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