The research aims to investigate the relationship between violence and democracy, having as a main reference the thoughts of Spinoza and Marx. We approach, in the first chapter, some of its concepts, which we understand as fundamental for a theoretical and practical comprehension of democracy. From concepts like immanence, conatus and mode of production, we see that politics emerges within the relations established between human beings to produce the means to persevere in existence, and from historical and natural characteristics of human sociability, in its two central expressions: cooperation and conflict. The violence of conflicts and external causes, as well as the particular mode of cooperation established to confront them, are elements of the constitution of the social body, which is the subject of the second chapter, where we analyze the relationship between capitalism, violence, sovereignty and law. In this chapter, we study the founding violence of state sovereignty and capitalist relations of production, advancing towards understanding it as an obstacle to the achievement of radical democracy. We observed, moreover, that the obstacle of sovereign violence and relations of production back when challenged by the armed power of the people. Nevertheless, the relationship between democracy and violent popular explosions remains contradictory. In the third and final chapter, we face this contradiction, as we seek to understand the extent to which relations between the armed bodies and the popular power constitutes, at the same time, a threat to the radicalization of democracy and the hope for its realization.