J. Edgar Hoover (1895-1972) was appointed assistant director of the Bureau of Investigation in 1921, and director in 1924; he was the popular (and then controversial) director of the U.S. Federal Bureau of Investigation from 1935 until his death in 1972, at age 77.

J. Edgar Hoover was born into a Scottish Presbyterian family of civil servants in Washington, D.C. on New Year's Day, 1895; his mother called him Edgar from the day he was born. He was a leader of the student cadet corps in high school, and a champion debater. He taught Sunday school at Old First Presbyterian Church. His life-long guiding principles were formed early: he was convinced that middle-class Protestant morality was at the core of American values, and he harbored a deep distrust of alien ideas and movements that called those values into question.

Working days and attending school at nights, Hoover earned his Bachelor of Law...