The following article analyzes some matters of militant subjectivity in the “Movimiento de Izquierda Revolucionaria” (Left Leaning Revolutionary Movement) (MIR 1965-1975). From a cultural point of view, supported by Lechner and Williams’ theories, it is possible to understand some aspects of militants’ every day life, their motivations, reasons, and the passions that mobilized those who embraced the dream of a socialist revolution. The mere rational adscription to a political-ideological project explains only partially the militancy of a man or a woman’s experience that persisted on their political purpose, even when defeat scenario was imminent.