4. John Wayne Gacy
With the rate of 33 proved killings of boys and young men, John Wayne Gacy was one of the most dangerous serial killers who ever lived. From the early ’70s to 1978, he cruised through the shady Chicago neighborhoods and picked up his victims.
He used several vehicles, but when he was caught, he had a black late ’70s Oldsmobile Delta 88, which he chose for its big trunk. A creepy detail about him was that Gacy worked as a clown at children’s birthday parties where he picked some of his victims. When they caught him, the press called him the “Killer Clown.”