The book doesn't say exactly how Sonny made his bones, but it does say how he took over the family's defense after his father was shot, and showed "a genius for urban guerilla warfare."
The episode of the two furnace repair guys is a gem of a story, but Sonny didn't kill them.


Ntra la porta tua lu sangu � sparsu,
E nun me mporta si ce muoru accisu...
E s'iddu muoru e vaju mparadisu
Si nun ce truovo a ttia, mancu ce trasu.