John Wayne Gacy

Between 1972 and 1978, the year he was arrested, Gacy raped and murdered at least 33 young men and boys, mostly teenagers. Although some of his victims' bodies were found in the Des Plaines River, he buried 26 of them in the small crawl space underneath the basement of his home and three more elsewhere on his property. He became known as "Killer Clown" because of the popular block parties he would throw for his friends and neighbors, entertaining children in a clown suit and makeup as "Pogo the Clown".

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Adolf Hitler

One of the foundations of Hitler's social policies was the concept of racial hygiene. It was based on the ideas of Arthur de Gobineau, a French count; eugenics, a pseudo-science that advocated racial purity; and social Darwinism. Applied to human beings, "survival of the fittest" was interpreted as requiring racial purity and killing off "life unworthy of life." The first victims were children with physical and developmental disabilities; those killings occurred in a programme dubbed Action T4.[150] After a public outcry, Hitler made a show of ending this program, but the killings in fact continued (see Nazi eugenics).

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H. H. Holmes

American serial killer H. H. Holmes was hanged in Philadelphia in 1896 after confessing to 27 murders. Joseph Vacher was executed in France in 1898 after confessing to killing and mutilating 11 women and children

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Gilles de Rais

Gilles de Rais, seigneur et baron de Rais (1404-1440), was a Breton knight, a leader in the French army and a companion-in-arms of Joan of Arc. He is best known as a prolific serial killer of children.

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