A Brazilian doctor has been sentenced to 77 years in prison for his part in the murder and sexual mutilation of boys in the Amazon town of Altamira between 1989 and 1993.
He is the third person to be sentenced. Two more members of the occult sect to which they are said to belong will go on trial later this month.
A government prosecutor said investigations into the disappearance of another six boys, who were abducted at the same time but never found, will begin.
The families of the victims cheered and cried when the judge sentenced Dr Anisio Ferreira de Souza for the murder and mutilation of three boys and the attempted murder of two others.
During the trial in the northern Brazilian city of Belem, the jury heard that the mutilations, when the boys' genitals were removed, had been carried out with medical expertise.
The victims had been anaesthetized - not from concern for their suffering, but so their screams would not be heard.
The doctor is the third member of the occult sect accused of organising the abduction and mutilation of boys in Altamira to be sentenced.
Another doctor will go on trial next week and the woman alleged to be the leader of the sect, Valentina Andrade, will be tried later in the month.
The judge ordered her to be remanded in custody after it was discovered that she had tried to leave the country in order to escape trial.
A public prosecutor said that there was evidence that the sect, called the LUS, or Superior Universal Alignment, whose headquarters are said to be in Argentina, also has followers in other countries, including Holland and Paraguay.
It is believed that the boys' sexual organs were used in rites of black magic.
Investigations into the whereabouts of another six boys who were abducted at the same time and then disappeared, are now promised.