In response to the September 11, 1973 coup d'État in Chile, and the repression by the Junta that came to power, a major wave of international solidarity brought together a wide range of stakeholders. Focusing on specific actors, like local associations in Chile, the World Council of Churches in Geneva or Amnesty International, this paper analyzes how different levels of action and multiple networks, according to various logics, notably around the issue of human rights, were gradually set up on a transnational scale during the 1970s, between the Americas and Europe. [ABSTRACT FROM AUTHOR]