JE Hoover was not "a blackmailer." He did indeed keep files on American officials, but he used them to protect the country from corruption. This is the opinion of the late Ted Gunderson, who began working for the FBI before he was technically allowed to (via special permission from JEHoover himself).
Gunderson went on to lead a distinguished career at the FBI, and was awarded the nation's top law enforcement official upon his retirement. He then worked independently as a private investigator and helped expose the infiltration of our nation's institutions by Satanists. He helped expose the fact that the corpses of dead soldiers were being stuffed with drugs as a way for the clowns to smuggle drugs into America. He also exposed the McMartin preschool as a Satanist pedo-cult when he had the former site forensically excavated and revealed tunnels beneath the preschool.
He was killed by arsenic poisoning.
Hoover's files (which were, in my opinion, a bad idea), were stolen from his home by James Angleton--Mossad's mole who ruined our entire government and helped entrench the deep state.