The Ambivalence of Good examines the genesis and evolution of international human rights politics since the 1940s. Focusing on key developments such as the shaping of the UN human rights system, decolonization, the rise of Amnesty International, the campaigns against the Pinochet dictatorship, the moral politics of Western governments, or dissidence in Eastern Europe, the book traces how human rights profoundly, if subtly, transformed global affairs. Moving beyond monocausal explanations and narratives prioritizing one particular decade, such as the 1940s or the 1970s, The Ambivalence of Good argues that we need a complex and nuanced interpretation if we want to understand the truly global reach of human rights, and account for the hopes, conflicts, and interventions to which this idea gave rise. Thus, it portrays the story of human rights as polycentric, demonstrating how actors in various locales imbued them with widely different meanings, arguing that the political field evolved in a fitful and discontinuous process. This process was shaped by consequential shifts that emerged from the search for a new world order during the Second World War, decolonization, the desire to introduce a new political morality into world affairs during the 1970s, and the visions of a peaceful international order after the end of the Cold War. Finally, the book stresses that the projects pursued in the name of human rights nonetheless proved highly ambivalent. Self-interest was as strong a driving force as was the desire to help people in need, and while international campaigns often improved the fate of the persecuted, they were equally likely to have counterproductive effects.The Ambivalence of Good provides the first research-based synopsis of the topic and one of the first synthetic studies of a transnational political field (such as population, health, or the environment) during the twentieth century. Based on archival research in six countries, it breaks new empirical ground concerning the history of human rights in the United Nations, of human rights NGOs, of far-flung mobilizations, and of the uses of human rights in state foreign policy.