In January 1966, delegates from the liberation movements of eighty-two nations came together at the Tricontinental Conference in Havana, Cuba, to form an alliance against imperialism. This alliance, called the Organization of Solidarity with the People of Africa, Asia, and Latin America (Organización de Solidaridad de los Pueblos de Africa, Asia y América Latina, OSPAAAL), quickly became the driving force of international political radicalism and the primary engine of radical cultural production throughout the world. I argue that this influential political movement, which has been the subject of surprisingly few scholarly studies, forms the ideological backbone of current conceptualizations of global subalternity, such as the increasingly circulating notion of the Global South. Through close analysis of documents from OSPAAAL's propaganda apparatus, namely the Tricontinental Bulletin and a newsreel by Santiago Álvarez called Now (1965), I examine how OSPAAAL, through its engagement with the African American Civil Rights Movement, presents a theory of transnational subaltern political resistance that is resurfacing in the contemporary notion of the Global South.