Ultras are football fans like no others. A hugely visible and controversial part of the global game, their credo and aesthetic replicated in almost every league everywhere on earth, a global movement of extreme fandom and politics is also one of the largest youth movements in the world. Yet they remain unknown: an anti-establishment force that is transforming both football and politics. In this book, James Montague goes underground to uncover the true face of this dissident force for the first time.