Carles Viñas Author

Carles Viñas has published several books including Skinheads a Catalunya (2004), El Mundo Ultra (2005) and Tolerancia Zero (2006). He researches sports extremism.

Natxo Parra is a labour lawyer and cooperative partner at Col.lectiu Ronda, Barcelona. He is co-author of 'The Concept of Radicalization' in Jihadist Islam:(Tirant lo Blanch, 2015) and Introduction to Political Science (Universitas, 2014).