241 © The Author(s) 2018 I. Kubbe, A. Engelbert (eds.), Corruption and Norms, Political Corruption and Governance, https://doi.org/10.1007/978-3-319-66254-1_12 What is the “Anti-corruption” Norm in Global Politics? Norm Robustness and Contestation in the Transnational Governance of Corruption Ellen Gutterman and Mathis Lohaus 1 INTRODUCTION The global norm of anti-corruption emerged as a force in world politics during the 1990s. Enacted in a complex cluster of policy initiatives across a variety of international governmental and non-governmental organiza- tions, in the private sector, and in government agencies around the world, “anti-corruption” is a rallying cry that raises few outright opponents. Today, a robust global regime of anti-corruption norms and rules guides the transnational governance of corruption, institutionalized across mul- tiple international treaties, regional bodies, non-governmental advocacy networks, and policies. E. Gutterman (*) Department of Political Science, Glendon College, York University, Toronto, ON, Canada M. Lohaus Department of Political Science and Communication Studies, University of Greifswald, Greifswald, Germany