My Sister married a Catholic and became Catholic herself. They are both very liberal tho she came from an extremely conservative family. I just assumed that my Brother-in-Law came from one of those Catholic families who believe in Communism or something very close.
To my surprise when I met several of them (they were a large family) they were even more conservative than my family was.
My family runs the extremes, too. One of my brothers is a huge Lib and huge Lib $upporter. He went to Notre Dame. I think the lack of women made him lose his mind.
The Catholic brand of Communism is euphemistically called Liberation Theology. If they had their way Che Guevera would be canonized. The Church would be well rid of them.