The 1973 Chilean coup gave rise to an unprecedented growth in a global human rights consciousness. In its aftermath, transnational activists from a diverse array of political and ideological backgrounds found common cause – indeed, a common language of human rights – in campaigns to ameliorate the repressive acts of the Chilean military junta. This article focuses on two models of activism in particular: Amnesty International, whose 1973 investigative mission set the terms of the global debate about human rights in Chile; and transnational solidarity activists, especially Chilean exiles from leftist parties, whose vision of social activism narrowed as their interest in human rights surged. These campaigns – while not without tensions over the role of politics in the moral appeal to human rights – both articulated a transnational discourse of human rights and created new activist techniques to foment moral outrage by revealing the prevalence of torture through the power of personal testimony.