PIERRE HAMEL is Professor of Urban Planning and Sociology at the University of Montreal. He is the author of Action Collective et Democratie Locale and co-editor of Action Collective et Enjeux Institutionnels. - HENRI LUSTIGER-THALER is Associate Professor of Sociology at Ramapo College in New Jersey. He has published several books on social movements and collective action. - JAN NEDERVEEN PIETERSE is Associate Professor of Sociology at the Institute of Social Studies in The Hague. He is co-editor of Review of International Political Economy and advisory editor of several journals. - SASHA ROSENEIL is Professorial Research Fellow in Sociology and Gender Studies at the University of Leeds. She is the author of Disarming Patriarchy and Common Women, Uncommon Practices: The Queer Feminisms of Greenham.