If you look at the bishop accountability site and look at the years when the abusing priests began doing their abusing it all began in the 30s and 40s. These four cardinals supervised the influx and as these priests rose in their ranks they brought others in. By the 1970s, certain seminaries were profoundly infected where good men were being turned away.
Our Lord said that just before His return all foundations would be shaken, which would include the Catholic Church.
I’m guessing one of those Cardinals was Francis Spellman.