I'd add:
"Boss of Bosses," biography of Paul Castellano.
"Little Man," biography of Meyer Lansky.
"A Man of Honor," autobiography of Joe Bonanno.
"The Black Book and the Mob," a scholarly, definitive view of Nevada gambling and its domination by gangsters; lots of context for "Casino," which I also recommend.
"Brothel," an absorbing look at legalized prostitution in Nevada.

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.