The KKK has a particularly violent past with a lot of “groups”. African-Americans, Jews and Catholics. I would say the majority of their violence was against African Americans, but they liked to spread the fear, intolerance and violence around. The actions of the KKK are/were extreme but the root of anti-Catholicism was found in all kinds of Protestant gatherings. I grew up in an affluent, WASP area and I was taught that Catholics were poor, uneducated and made up of the “undesirables” in society…seriously, that was a phrase in our family. My father was probably not too surprised when I converted to Catholicism (always a black sheep, here) but he sure wasn’t happy…