J. Edgar Hoover
![Official portrait, 1961](https://upload.wikimedia.org/wikipedia/commons/b/b0/Hoover-JEdgar-LOC.jpg)
Hoover expanded the FBI into a larger crime-fighting agency and instituted a number of modernizations to policing technology, such as a centralized fingerprint file and forensic laboratories. Hoover also established and expanded a national blacklist, referred to as the FBI Index or Index List.
Later in life and after his death, Hoover became a controversial figure as evidence of his secretive abuses of power began to surface. He was also found to have routinely violated both the FBI's own policies and the very laws which the FBI was charged with enforcing, and to have collected evidence using extensive amounts of illegal surveillance, wiretapping, and burglaries. Hoover consequently amassed a great deal of power and was able to intimidate and threaten political figures, including high-ranking ones. Provided by Wikipedia
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