Answer:
J Edgar Hoover was head of the FBI from its inception in 1935 until his death in 1972.
Explanation:
Hoover, as far as these groups would have been seen as an adversary. He had conservative right wing views and used the FBI to amass files on anyone he considered a threat to his right wing vision of the USA. These included leading civil rights activists such as Martin Luther King Jnr and more radical black activists such as Angela Davis and Malcolm X.
Such hostility was aimed at anyone considered on the left, for example those black listed in Hollywood during McArthyism.
Hoover also consistently denied that there was an organized crime family, the Mafia, in the USA. Some have speculated that this is because the Mafia blackmailed him.
