Introduction: Rivalry and Cooperation in Football / Christian Brandt, Fabian Hertel -- The Death of the Pope, Pacts and Boycotts: Modes of Cooperation in Polish Football Fandom / Radoslaw Kossakowski, Lukasz Bieszke -- Divided in Colours, United in Course? The Rivalry and Solidarity of Supporting Fans in Germany / Patrick Bresemann, Gabriel Duttler -- Building a Supporters' Culture and Growing the Game: Cooperation Between Soccer Supporters' Groups in North America / Markus Gerke -- Rivalry, Passion and Cooperation Between Argentinean Club Supporters / Verónica Moreira, José Garriga Zucal, Nemesia Hijós -- Brazil's Organised Football Supporter Clubs and the Construction of their Public Arenas Through Ftorj and Anatorg / Bernardo Buarque de Hollanda, Rosana Da Camara Teixeira -- The Criminalization of Mexican Football Fans and the Emergence of the Movement of United Mexican Supporters / Roger Magazine, Sergio Fernández González -- Torcida and Bad Blue Boys: From Hatred to Cooperation and Back / Benjamin Perasovic, Marko Mustapic -- Never the Twain Shall Meet? The Lack of United Effort Between Scottish Fans Against the Offensive Behaviour Act / Sean Huddleston -- Zimbabwe United? Exploring Cooperation and Contestations in the Context of National Football Team Fandom in Zimbabwe / Manase Kudzai Chiweshe -- Istanbul United: A Short-Lived Experience of Agonistic Pluralism / Ekin Can Göksoy, Okan Yilmaz -- The Unlikely Alliance of Ukrainian Football Ultras / Maryna Krugliak, Oleksandr Krugliak -- Final Remarks / Christian Brandt, Fabian Hertel