Sam Battaglia's cousins Paul, August and Frank were in the 42's and it is possible that Paul was one of the so-called leaders since he was once arrested together with Angelo Genna but there were also others such as Joe Calaro and Patsy Tardi. They also worked with Jack Zuta and some of Dago Manganos people such as Frank Laino. Once Mike DeStefano and two other 42 gang members bungled the hit on Laino for not fixing the trial of Mad Sam at the time and ended up shooting one of their own. I dont know if Giancana was one time leader but legend goes that he was a good wheel man, since the 42s were involved in the car theft racket, and also a shooter and his sponsors into the Outfit were allegedly Nitti and Campagna, which again is a proof that Nitti wasnt the boss at the time but instead it was Ricca