(born Jan. 1, 1895, Washington, D.C., U.S.—died May 2, 1972, Washington, D.C.) U.S. director of the Federal Bureau of Investigation (FBI). He entered the Department of Justice as a file reviewer in 1917; two years later, as special assistant to Attorney General A. Mitchell Palmer, he helped in the roundup and deportation of suspected Bolsheviks. In 1924 he was named director of the Bureau of Investigation, which he remade into a professional, merit-based organization.
In the 1930s he successfully publicized the FBI's success in tracking down and capturing well-known criminals. During this time, both the FBI's size and its responsibilities grew steadily. In the late 1930s Hoover received authorization to investigate foreign espionage in the U.S. and the activities of communists and fascists alike. When the Cold War began in the late 1940s, the FBI undertook intensive surveillance of communists and other left-wing activists in the U.S. Hoover's animus toward radicals of every kind led him to investigate both the Ku Klux Klan and Martin Luther King, Jr., as well as other African American activists in the 1960s. At the same time, he maintained a hands-off policy toward the Mafia, which was allowed to conduct its operations nationwide practically free of FBI scrutiny or interference. Hoover habitually used the FBI's enormous surveillance and information-gathering powers to collect damaging information on politicians throughout the country, and apparently he was able to intimidate even sitting presidents by threatening to leak damaging disclosures about them. He retained his post for 48 years, until his death.
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