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.