Despite the code of Omerta, the vow of silence every “made” Mafioso makes, there have been many “rats” in the mob's violent history. Turning on fellow gangsters has become commonplace, though there have always been snitches and informers who used the police to take out enemies and competitors. If found out, the informers were marked for death. But on the flipside, the turncoats gave the public a firsthand account of what life was like in the underworld. This chapter introduces you to some of the more famous, or infamous, Mafia informants.