First of a two-part programme in which Trevor McDonald takes viewers on a journey into the machinations of the American mafia, gaining unprecedented access to some of the people with first-hand experience of the money, glamour and violence associated with the country's infamous organised crime network. Trevor arrives in New York to meet John Alite, a former millionaire drug dealer who was also one of the most ruthless mafia killers of modern times. On a walk down the streets that were once his domain, John tells what it is like to shoot a mafia rival in cold blood. Trevor also meets Michael 'Mikey Scars' DiLeonardo, who, facing life in prison, agreed to testify against the mafia for the FBI. Mikey tells Trevor what it is like to live with the constant fear of reprisals - both for himself and his family - at the hands of the mafia brothers he chose to betray.

Second of a two-part programme in which Trevor McDonald takes viewers on a journey into the machinations of the American mafia. Trevor travels to Philadelphia, where he explores one of the bloodiest periods in the long history of the mob, as he sits down with Ralph Natale, the first ever mafia godfather to speak on television. In an extraordinary interview, Natale spells out just how ruthless a boss must be to control the men under him. In New Jersey, Trevor seeks out Ron Previte, who spent years playing both sides of the mob fence. Previte led a double life as high-ranking mobster and undercover FBI informer, earning more than one million dollars from the government for his role in convicting more than two dozen Philadelphia mafiosi.