Informant, rat, turncoat, Stool Pigeon... Snitch!! Vulgar language to a criminal. Salvatore "Sammy the Bull" Gravano is famous for turning informant to save his hide. Charles Becker is the first (and only?) cop in the U.S. put to death for killing Herman Rosenthal. And why do so many people snitch today? What are the risks? What if the evidence is faked? It's happened before!