Finocchio is italian slang for queer/fag.
Years ago I read Franco's book "Coming on Strong" it was a cheap knock off of Arnold's "An Education of a Bodybuilder"- pretty much like everything else Franco did in his career.
There were some decent chapters about his time boxing and pictures from the 76 Olympia, if I remember correctly.
But I also recall a couple of chapters about his friendship with Katz. He spent alot of time talking about training with Mike and hanging out with him. He described Katz as a good friend but belabored the point that Mike was very sensitive, lacked confidence and often depressed/sad.
It's been a long time since I read that book, probably 35 years or more. But the chapters on Katz always stood out to me. They didn't really flow with the rest of the book.