Survivors of the NXIVM self-help group-turned cult say Keith Raniere attracted people with his personality and kept them inside through fear.

Adolfo Constanzo led the Narco-Satanist Palo Mayombe cult in the gruesome torture and murder of college student Mark James Kilroy.

More than 20 years after Heaven’s Gate cultists took their own lives in hope of boarding a UFO hiding behind the Hale-Bopp comet, some still believe. 

Oxygen takes viewers inside some of the most terrifying cults in history.

Slaves in NXIVM were branded with the initials of leader Keith Raniere using a cauterizing pen, a medical device used to burn flesh.

Lynette “Squeaky” Fromme said although she wasn’t ready for killing she “hoped that if I needed to I would.”

To some Charles Manson was a savior, to others he was a diabolical manipulator who destroyed countless lives. 

Just hours before their death, Manson Family victims Leno and Rosemary LaBianca had been talking about the Sharon Tate murders that happened the night before.  

Charlie Manson seduced many of his female followers by targeting those who were “hungry for a connection” and becoming exactly what each woman had been looking for.  

Charles Manson’s followers made the 1970 Tate-LaBianca murder trial into a spectacle inside and outside the courtroom.