My favorite pizza hangout in Dallas is Campisi's. There is no evidence that old Joe Campisi was in the mob, but members of the mafia liked his pies, including Jack Ruby.
I personally, cannot bring anything to that question. However, he was a friend, if nothing else, to Tony Accardo in Chicago, and Accardo was THE MAN.. I took his daughter to her prom.. YIKES!
I too went to Campisi's often in Dallas when I went to my Club in Dallas.. He and I talked about his friendships in Chicago, but never about those things, and I wouldn't expect anything else..
I owned Elan, opened Jan 5, 1970, and invited the old man, Joe Campisi, but to my knowledge he never came to the opening, and I think he died less than a month later..