Ross travels from Liverpool to LA and Belize to Bulgaria securing access to the brutal gangs who terrorise their communities.
Ross arrives in LA amidst a turf war. In this video Ross talks to Blood members to hear their side of the story.
Check out the gripping highlights from the first and second series. See Ross meet a Maori gang in New Zealand, in the Rio slums, with the Mara Salvatruchaor in El Salavador, and the Numbers gang that thrives on over-crowded prisons in South Africa.