Ultras are football fans like no others. A hugely visible and controversial part of the sporting game. This movement of extreme fandom and politics is also one of the largest youth movements in the world. In this episode, James Montague, author of '1312: Among the Ultras: A journey with the world's most extreme fans' speaks to Ros Urwin about how the movement began and how it grew to become a global phenomenon that now dominates stadiums across the world. 

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