Pope Francis issued a groundbreaking law Thursday requiring all Catholic priests and nuns around the world to report clergy sexual abuse and cover-up by their superiors to church authorities, in an important new effort to hold the Catholic hierarchy accountable for failing to protect their flocks.

The new church law provides whistle-blower protections for anyone making a report and requires all dioceses around the world to have a system in place to receive the claims confidentially. And it outlines procedures for conducting preliminary investigations when the accused is a bishop, cardinal or religious superior.

It's the latest effort by Francis to respond to the global eruption of the sex abuse and cover-up scandal that has devastated the credibility of the Catholic hierarchy and his own papacy. And it provides a new legal framework for U.S. bishops to use as they prepare to adopt accountability measures next month to respond to the scandal there.

The law doesn't require them to report to police. The Vatican has long argued that doing so could endanger the church in places where Catholics are a persecuted minority. But it does for the first time put into universal church law that they must obey civil reporting requirements where they live, and that their obligation to report to the church in no way interferes with that. If it is implemented fully, the Vatican could well see an avalanche of abuse and cover-up reports in the coming years. Since the law is procedural and not criminal in nature, it can be applied retroactively, meaning priests and nuns are now required to report even old cases of sexual wrongdoing and cover-ups, and enjoy whistleblower protections for doing so.