As Snakes previously pointed out, many opf these members were too young to be associated with the 42's but my personal belief is that thouse same 42's were considered to hold membership of quite young criminals. So my point is that the DeStefanos and Nicoletti might've been members of the gang. The Battaglias, including brothers and relatives, were for sure members of the gang and also Giancana, Leonard Caifano and possibly Louie Fratto. As for Marshall Caifano, I believe he was too young but who knows, his older brother was member. I really dont have any proof or to tell you the turth I have never done any deep research on Buccieri's membership but he can be a good "candidate" also.