On the eve of second round of brazilian presidential elections, regional electoral court ordered the search and seizure of alleged irregular propaganda material inside public universities without a court order. In record time, the case has been shifted from the political arena to the judicial sphere. This paper aims to analyse ADPF No. 548 as a notorious case of judicialization of politics adjudicated by the Federal Supreme Court of Brazil, in which the Judiciary Power plays the role of inspector of the democratic process such as the fifth branch pointed out by Ran Hirschl. In addition, it is possible to verify elements of expansion of power and procedural activism by the court based on individual activist behaviors concentrated by the justices, when pronouncing a monocratic decision only one day after the distribution of the process. This phenomenon characterizes an imbalance in separation of powers, due to interference in issues related to Legislative and Executive Powers.