J. Edgar Hoover

(1875-1972) director of the FBI credited with turning the bureau into an efficient and powerful agency (started a crime laboratory, fingerprint file, and police training programs)

John Edgar Hoover (January 1, 1895 –  May 2, 1972) was the Director of the Federal Bureau of Investigation (FBI) of the United States. He founded the present form of the agency, and remained director for 48 years until his death. During his life, Hoover was highly regarded by much of the U.S. public, but since his death various allegations have tarnished this image.
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Noun
1. United States lawyer who was director of the FBI for 48 years (1895-1972)
(synonym) Hoover, John Edgar Hoover
(hypernym) lawyer, attorney