Anísio Ferreira de Sousa was a Brazilian doctor practicing in the state of Pará. He was known in his community for providing affordable medical care and engaging in charitable activities, such as offering free consultations to the underprivileged and organizing donation campaigns for needy families.

Between 1989 and 1992, a series of gruesome crimes occurred in Altamira, Pará, Brazil, involving the abduction, sexual mutilation, and murder of boys aged 8 to 14. The victims were found with signs of torture, including castration and, in some cases, eyes gouged out.

Investigations led to the arrest of several individuals, including Anísio Ferreira de Sousa. The prosecution's case against de Sousa heavily relied on the testimony of an evangelical pastor who claimed to have witnessed satanic rituals at de Sousa's residence, during which de Sousa allegedly prayed to the "god of darkness."

Despite the lack of physical evidence linking de Sousa to the crimes and the witness's inconsistent statements—where he repeatedly denied, reaffirmed, and altered his testimony—the court convicted de Sousa of three murders and two attempted murders in 2003, sentencing him to 77 years in prison.

The case remains controversial, with critics pointing to the reliance on dubious testimony and the absence of concrete evidence as significant flaws in the judicial process.