The scope of this article is to study Competition Law and establish its conception in and for contemporaneity, based on which the Brazilian System for the Defense of Competition will be analyzed. Given its analytical and critical conception, the work is carried out according to the deductive method, without forgetting the use of the hermeneutic-dialectic approach. After analyzing some instruments considered adequate to repress cartelization, the study clarifies the nuances that permeate it from the perspective of the Competition Defense Law. Understood, in contemporary times, as an instrument for the implementation of public policies aimed at safeguarding free competition, the repression of the abuse of economic power and the pursuit of anti-competitive offenses, the Brazilian Antitrust Law structured a system of dual protection of competition - control of structures and conduct - and, by authorizing CADE to enter into agreements with infringing economic agents, it ensured the use of effective instruments for proving illegal practices, repression- punishment and prevention, especially with regard to cartels.