It is also said that Cascio Ferro, The Black Hand, was also the used for the Fanucci character. This is skeptical though.

The Don Mike Ferro

And you liar, teller of tall tales: you trample all the Lord's commandments underfoot, you murder, steal, commit adultery, and afterward break into tears, beat your breast, take down your guitar and turn sin into a song. Shrewd devil, you know very well that God pardons singers no matter what they do, because he can simply die for a song.