Giuseppe Fanara, 60, who is locked up in the Rebibbia prison, attacked seven guards when they came to inspect his cell, the Guardian reported, citing the daily Il Messagero.
The cannibalistic Cosa Nostra crook is nine years into his sentence under Italy’s tough penal code reserved for mob bosses, who are isolated behind bars to prevent them from running their clans from inside the joint.
“During the altercation (Fanara) bit off the guard’s little finger on his right hand,” the Italian paper reported. “The finger disappeared, leading a Rome prosecutor to conclude it had been eaten.”
Fanara then charged the six other guards, using a broomstick as a weapon as he shouted: “I’ll slit your throats like pigs!”
He has since been transferred to Sardinia’s high-security Sassari prison, where he faces new charges including aggravated assault and resisting arrest, according to the outlet.
Fanara was arrested in 1999 when police raided a mob conference, according to the Times of London.
At the time, he was on the lam after taking part in the murder of Giuliano Guazzelli, an investigator.