Idk if this has ever been discussed here or if I missed it in the search function but Big Paul was a capo in the early 70s before he became boss right?

I read that was the position when Carlo picked him as boss. Does anyone know is this true, where he was a Capo out of, who was in his crew and who took over when he got upped? I do apologize if this has been discussed before and I missed it but any insight would be much appreciated. Thanks guys