Donatella della Porta is Professor of Sociology at the European University Institute. Among her recent publications are: Approaches and Methodologies in the Social Sciences (with Michael Keating), Cambridge University Press; Voices of the Valley, Voices of the Straits (with Gianni Piazza), Berghan, 2008; The Global Justice Movement, Paradigm, 2007; (with Massimiliano Andretta, Lorenzo Mosca and Herbert Reiter), Globalization from Below, The University of Minnesota Press; (with Abby Peterson and Herbert Reiter), The Policing of Transnational Protest, Ashgate 2006; (with Manuela Caiani), Quale Europa? Europeizzazione, identitA e conflitti (Il Mulino, 2006); (with Mario Diani), Social Movements: an introduction, 2nd edition, Blackwell, 2006; (with Sidney Tarrow), Transnational Protest and Global Activism, Rowman and Littlefield, 2005. Alberto Vannucci is Professor of Political Science at the University of Pisa. Among his publication on corruption Corrupt Exchange (New York, 1999, with D. della Porta), Unclean Hands (Rome 2007, with D. della Porta). Other publications: The spectre of competitiveness: the Institutional Roots of the Italian Decline (Rubbettino 2006 with R. Cubeddu); The Governance of Uncertainty: Public Choice and Institutional Change (Soveria Mannelli 2004). He has collaborated with the Italian Parliamentary Committee for the Prevention of Corruption.