The issue with the Knights of Columbus, is they are a Chatholic organization and until the papal ban on masonry was lifted in 1982 the church would excommunicate any member, not only Knights of Columbus if they became masons.The only thing that I've ever heard of causing a conflict was some chapters of Knights of Columbus are not allowed to be Masons. Not sure if that is entirely true, but I have heard it from several different sources. But our Lodge has worked with the local KoC chapter for charities. So who really knows.