An agency of the US federal government that deals principally with internal security and counter-intelligence and that also conducts investigations in federal law enforcement. It was established in 1908 as a branch of the Department of Justice, but was substantially reorganized under the controversial directorship (1924–72) of J. Edgar Hoover.
Definition of Federal Bureau of Investigation in:
What do you find interesting about this word or phrase?
Comments that don't adhere to our Community Guidelines may be moderated or removed.