The most disturbing and least known serial killers in history:

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They are some of the most disturbing and lesser-known serial killers in history — men whose crimes reveal the darkest side of human nature.

In this chilling documentary, Serial Killer Documentary explores the horrifying stories of:

Pietro Pacciani, the Italian “Monster of Florence,” accused of a series of brutal murders that terrified Tuscany.

John Joseph Joubert IV, the American killer who preyed on young boys in Nebraska and Maine.

Sergei Ryakhovsky, the Russian “Balashikha Ripper,” who murdered dozens with chilling precision.

Leszek Pękalski, the Polish “Vampire of Bytów,” suspected of killing more than 60 people.

Futoshi Matsunaga, the Japanese torturer who manipulated and killed entire families.

Ahmad Suradji, the Indonesian ritual killer who murdered women believing it would increase his power.