This paper aims at outlining the main processes that, in Argentina’s recent past, may enable us to understand the emergence, development and eventual defeat of the social protest movement and the political radicalization of the period 1960-70s.Here, as in previous papers, we resort to the concept of new left toname the movement that, though heterogeneous and lacking a unified direction, became a major unit in deeds, for multiple actors coming the most diverse angles coincided in opposing the vicious political regime and the social order it supported. Consequently, we shall try to reinstate the presence of such wide range of actors: their projects, objectives and speeches. Some critical circumstances shall be detailed and processes through which protests gradually amalgamated will be shown. Such extended politicization provided the frame for quite radical moves ranging from contracultural initiatives and the classism in the workers’ movement to the actual action of guerrilla groups. Through the dynamics of the events themselves we shall locate the peak moments as well as those which paved the way for their closure and eventual defeat in 1976.