This article addresses one of the instances of the transnationalisation of state terrorism that took place at the end of the Cold War in Latin America. It examines the collaboration of the Argentine military dictatorship with the governments of Guatemala and Honduras in their ‘fight against subversion’ (1980–3) through previously unexplored archives. It presents the different degrees and forms of inter-governmental collaboration, the people responsible, the time frame, and the institutions, seeking to elaborate on the role of this collaboration in the repressive processes of each nation's historical experience. In general terms, this article contributes to transnational studies of the right wing during the recent history of the Latin American Cold War.