Federal Bureau of Investigation
Flag of the Federal Bureau of Investigation
Badge of an FBI Special Agent
||July 26, 1908
as the Bureau of Investigation|
J. Edgar Hoover Building
Washington, D.C., U.S.
||Fidelity, Bravery, Integrity
 (October 31, 2014)
USD (FY 2016)
Department of Justice
Office of the Director of National Intelligence
The Federal Bureau of Investigation (FBI), formerly the Bureau of Investigation (BOI), is the domestic
security service of the
United States, and its principal
law enforcement agency. Operating under the jurisdiction of the
U.S. Department of Justice, the FBI is also a member of the
and reports to both the
Attorney General and
the Director of National Intelligence.
 A leading U.S.
counterintelligence, and criminal investigative organization, the FBI has
jurisdiction over violations of more than 200 categories of
Although many of the FBI's functions are unique, its activities in support of national security are comparable to those of the British
MI5 and the Russian
FSB. Unlike the
Central Intelligence Agency (CIA), which has no law enforcement authority and is focused on intelligence collection overseas, the FBI is primarily a domestic agency, maintaining 56
field offices in major cities throughout the United States, and more than 400 resident agencies in lesser cities and areas across the nation. At an FBI field office, a senior-level FBI officer concurrently serves as the representative of the
Director of National Intelligence.
Despite its domestic focus, the FBI also maintains a significant international footprint, operating 60 Legal Attache (LEGAT) offices and 15 sub-offices in
U.S. embassies and consulates across the globe. These overseas offices exist primarily for the purpose of coordination with foreign security services and do not usually conduct unilateral operations in the host countries.
 The FBI can and does at times carry out secret activities overseas,
 just as the CIA has a
limited domestic function; these activities generally require coordination across government agencies.
The FBI was established in 1908 as the
Bureau of Investigation, the BOI or BI for short. Its name was changed to the Federal Bureau of Investigation (FBI) in 1935. The FBI
headquarters is the
J. Edgar Hoover Building, located in