Delve into the secret underworld of the American Mafia as told by the criminals who lived it and the law enforcers who hunted it. This dramatic six-part series chronicles the true-life story of the modern Mob in America as former mobsters informants and FBI agents expose the takedown of the deadliest and most infamous organized crime ring in U.S. history. A combination of recently declassified files first-person accounts by federal officials and the mafioso themselves and rare archival footage sheds a new light on the raw violent and corrupt underworld that gripped America for decades.