The scope of the alleged abuse was vast. Charges are pending against 13 suspects; a 14th person pleaded guilty to sexual abuse, including rape, and was sentenced to 10 years in prison. The case of the accused ringleader - an octogenarian Italian priest named Nicola Corradi - is set to go before a judge next month.
Corradi was spiritual director of the school and had a decades-long career spanning two continents. And so his arrest in late 2016 raised an immediate question: Did the Catholic Church have any sense that he could be a danger to children?
The answer, according to a Washington Post investigation that included a review of court and church documents, private letters, and dozens of interviews in Argentina and Italy, is that church officials up to and including Pope Francis were warned repeatedly and directly about a group of alleged predators that included Corradi.
Yet they took no apparent action against him.
"I want Pope Francis to come here, I want him to explain how this happened, how they knew this and did nothing," a 24-year-old alumna of the Provolo Institute said, using sign language as her hands shook in rage. She and her 22-year-old brother, who requested anonymity to share their experiences as minors, are among at least 14 former students who say they were victims of abuse at the now-shuttered boarding school in the shadow of the Andes.