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The Federal Bureau of Investigation or FBI are the federal criminal intelligence agency of the United States that mainly deal with organized crime, gangs, and internal problems within the government. The FBI's most-famous leader was J. Edgar Hoover, who led a ruthless investigation into the Italian Mafia in the 1940s-1970s. The FBI is as against the criminal organizations as they are for them, however; FBI Agents were bribed commonly by families to put heat on other families, such as during the Five Families War.