Leonardo Vitale was a mafioso that decided of collaborate in 1977. Called the Valachi of Altarello (a Palermo neighborhood) but was too soon and given that the "mafia don't exist" he ended up in a mental asylum and killed in 1984 after get out.

Claudio Sicilia was a member of The Magliana Gang that flipped in 1985 and let to 60 arrests. After the collaboration was let without protection and was killed in 1991.

James "Whitey" Bulger boss of Winter Hill Gang from 1979 to 1995 and long time informant for FBI to destroy Boston Mafia.
Ended killed in a very fiere mode by lifer Geas and mobster DeCologero.