At least 60 children were abused by Marcial Maciel, founder of the ultra-conservative Catholic order Legionaries of Christ, an investigation has found.
In 2006, Maciel was ordered to retire to a life of penitence after years of allegations of sexual abuse of minors.
He died two years later at the age of 87 without facing his accusers.
"There are probably more cases of abuse than those in the report and the statistics will have to be updated regularly," the report said.
It added that a process of "reparation and reconciliation" had begun with 45 of the victims.
What happened to the accused priests?
According to the report, six of the 33 accused priests died without being tried, one was convicted, and one is currently awaiting trial - and has "already [been] removed from clerical status".
Another 18 are still part of the organisation, but they have been removed from tasks where they interact with the public or with children.
The report added that 14 of the 33 priests were also victims themselves, which it said highlighted the "chains of abuse", where "a victim of a Legionnaire, over time, becomes in turn an aggressor".
Several men publicly accused Maciel before his death of sexually assaulting them while they were in a seminary from the 1940s to the 1960s.
At the time he fiercely denied it, saying in 2002: "I never engaged in the sort of repulsive behaviour these men accuse me of."
In 2006, Pope Benedict XVI ordered him to retire as head of the Legionaries of Christ over the allegations, which had been ignored by his predecessor Pope John Paul II when they first emerged.
After Maciel's death in 2008, it was discovered that he had also fathered several children.
On Tuesday, Pope Francis declared that the rule of pontifical secrecy would no longer apply to the sexual abuse of minors.
The Church previously shrouded sexual abuse cases in secrecy, in what it said was an effort to protect the privacy of victims and reputations of the accused.
Restrictions have now been lifted on those who report abuse or say they have been victims.
The measure is designed to improve transparency and the ability of the police and other civil legal authorities to request information from the Church.