As FBI director from 1924 until his death in 1972, Hoover built a more efficient crime-fighting agency and established a centralized fingerprint file, a crime laboratory, and a training school for police. After World War II, he turned to the perceived threat of Communist subversion with a focus that his many critics considered obsessive. It has been verified that he orchestrated systematic harassment of political dissenters and activists, including what celebrated civil-rights leader? Discuss (http://forum.thefreedictionary.com/postst57908_J--Edgar-Hoover-Appointed-Director-of-FBI--1924-.aspx)