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Joseph Valachi testifying before the U.S. Senate Underworld informant Joseph Valachi taking the oath as he begins testimony before the Senate Permanent Subcommittee on Investigations in Washington, D.C., on September 27, 1963, breaking his vow of silence to describe his role in the Cosa Nostra crime syndicate. (more) omertà Mafia code of silence Written by Urnesha Bhattacherjee Associate Editor,...