This study analyses Brazil historically during the 60's and 70's, focusing on the strengthening/implementation of the so called National Security Doctrine emerged mainly from the Escola Superior de Guerra. It shows some characteristics of the repressive system from that period, analyzing some aspects of the national security laws, as well as the performance of the military justice. Finally, the study shows the production of a new National Security Doctrine, becoming stronger by the 90's, no longer against political opposition, but especially against the socially excluded ones.
military dictatorship; violence; Brazil in the 70’s and 90’s