The Catholic Church is the most publicized. This garbage is in all institutions from the Boy Scouts, Freemasons, US Government, Police, religions of all sorts, etc.. It goes on in every town, and in most neighborhoods. There are wolves among us at all times. From the most respectable looking to the sloppy homeless guy in the city. It could be your mother-in-law, uncle, grandfather, brother, neighbor, etc.
Moral of the story - watch your kids and don't trust blindly.