Ole "J" had P**is envy (from Underground History, Points in Case)
It's well known that FBI director J. Edgar Hoover was a flaming, cross-dressing closet queen with an obsession for large male appendages. Hoover was such an insatiable sausage-hound that when one of his ex-lovers invented a device to pick up dirt, he named it “The Hoover” in his honor. Like its namesake, the Hoover vacuum cleaner could purportedly suck a softball through a garden hose.
Hoover had outlaw John Dillinger under arrest, but when “Big John” broke out of the Crown Point Indiana jail back in ‘33, he humiliated Hoover and the FBI. Hoover hated Dillinger because he was jealous of Johnny's rumored 23-inch “Tommy-Gun.”
After he was shot outside the Biograph in Chicago, Hoover had Dillinger's freakishly large trouser-snake surgically removed and preserved in a jar of formaldehyde on his desk as a paperweight well into the 40's. He subsequently donated it to the Smithsonian Institute.