This research seeks to debate what is considered as corruption from the Brazilian Federal Supreme Court (STF) point of view and when this Court considers as necessary to operate the law in favor of the governability and manage the country governance choices. This study purpose, so, aims, first, how the STF judgments are based in outside the law reasons, although they are not explicated. It also discusses how the STF considers political exchanges to be legitimate from the leading cases studied.

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... inally, this study analyses whether STF's decisions made case-by-case basis, according to the Country governance or governability needs, or if the Brazilian Supreme Court decides on a casuistic basis. As empirical material, it considers, for a qualitative analysis, two specific leading-cases that concerns about interferences in the federal government functioning, called as collorgate and monthly-payment allowance (mensalão). The investigation analysis methodology, therefore, considers the decisions coherence and integrity in its arguments in order to identify possible casuistic decisions and also try to understand what was considered as a regular or a corrupted political relationship. The development of the research, then, is made in five chapters. At the first chapter we explain the legal arguments used by STF in its decisions, which involved an explanation of law as a language, the STF as an institution that motivates its decisions within the legal language, as well as about criminal proceedings' debate that was sustained in the leading cases analyzed. In the second chapter we considered the outside point of view that may influence the STF's decision-making regarding corruption leading cases. In this way, we developed about the concepts of governance, governability and corruption, especially the approaching the conflict between the international and local insight about governance, as well as the Brazilian political exchange as a system of exchange of words and things. From this perspective, the third and fourth chapters are devoted to the collorgate and monthly-payment allowance (mensalão) analysis, respectively, according to the proposed methodology. Finally, In the end, this we concluded that STF considers issues related to the governance and governability maintenance to judge corruption leading cases, as well as that we could find casuistic decisions in both leading cases studied, what suggest "privilege areas" granted to the accused. It was also pointed out that the Court seems to understand the Brazilian political exchange as gift as legitimate way of policy. We also concluded that the constant changing process between the limits of the personal attention (pessoalidade) of the Brazilian politics and the control zones are in permanent reconstruction and it doesn't mean a space for corruption, since they are ways to avoid it. The corruption could be, so, in the limit zones that try to escape from the multiple voices discourse in constant reconstructing.