During these years, he participated in many social movements in the country and went clandestine after the coup of 1964. At the peak of his political militancy, he participated in the POLOP, a movement that he helped create in 1961 and took control over in 1964. POLOP had an opposing view to the communist parties and Stalinism, calling the left-wing revolutionary movements to organize against the policy of a united front with the bourgeoisie, which was proposed by the PCB.