The reason Catholics are proscribed (by their church, not by the Freemasons) from being Masons is because the Freemasons have refused to submit their rituals and beliefs to the scrutiny of the Catholic Church.

And it is the case that the Knights of Columbus were founded to scratch the "fraternal lodge itch" which was present in men of earlier days.

Now, sadly, the Knights seem to have turned into an arm of the Republican Party in the US. Here in the Northeast, the KofC hall was a good place to go (if a member or a guest of same) for really cheap drinks. Also true of the Veterans of Foreign Wars and Oddfellows, and especially the Moose lodges.

Do many Masonic lodge have pubs for members only?