Alleged: in 1978, Cdl. Gagnon gave to Pope St. Paul VI the fruit of his publicized investigation of the curia, documenting widespread moral and financial corruption. This dossier was committed to John Paul I, and then to St. John Paul II. No concrete action was taken.
Facts: in 2012, Benedict XVI was given the fruit of his own curial investigation: a 300 page dossier detailing widespread moral and financial corruption. Benedict resigned and presumably committed this dossier to his successor. Pope Francis has taken no noticeable action on this. In 2018, McCarrick was exposed as a serial predator, and credible allegations (Vigano) tied this directly to Pope Francis and St. John Paul II. The Pennsylvania Grand Jury report documented massive moral and financial corruption. Later documents have proven Vigano’s allegations including the lying of Cdl. Donald Wuerl, whose friend, Bp. Wilton Gregory has succeeded him in Washington DC. Pope Francis has not released any investigation on McCarrick but issued a Motu Proprio stipulating that the bishops will investigate themselves.
Opinion: Until all dossiers of corruption are released – both the 2012 and the 1978 if it exists – it is difficult to reasonably trust the bishops nor the Vatican. Every bishop must confess the Declaration and must then put this into practice by excommunicating all heretical preachers and pro-abort Catholics, as His Excellency Poprocki has done. Only after this is done can the faithful reasonably trust bishops.
This is attested by the eyewitness account given in the book The Godmother, (reported about in Crisis) and also reported at Catholic Exchange, but I have not been able to find better sources about this investigation and this dossier.
The victim of McCarrick, James Grein, told Dr. Taylor Marshall in an interview that he told St. John Paul II everything about McCarrick in person in 1987. See both of these interviews here and here.