The French serial killer Joseph Vacher lived from 1868 to 1898. The police assume that he had at least 11 people on his conscience. Vacher's victims were mostly young agricultural workers. It didn't matter whether they were female or male.
Alexander Pichushkin is a Russian serial killer from Moscow. In 1992 the then 18-year-old student began planning the so-called checkerboard murders together with his friend and classmate Mikhail Odiichuk.
Joachim Kroll was a German cannibal and serial killer. He was convicted of eight murders despite admitting fourteen murders. Kroll started his series of murders in 1955 after his mother died. He worked as a toilet man for Mannesmann, later for Thyssen-Krupp.