This work has the objective to reflect about the ways that the idea or the concept of legality transited by the political environment of Brazilian democratic experience during the period Post-II World War. In that moment, being on the legality side constituted in a fundamental element in the speeches from a diversity of political groups and with opposite proposals and solutions. In the period after the suicide of president Getúlio Vargas, particularly during the episodes of the political-military intervention in November of 1955, the crisis of Jânio Quadros resignation and the parliamentary solution of 1961, and the coup of 1964, the discussions about legality became a priority. This way, the use of the legality argument, beyond the conspirations, threats and repressions, was shown primordial to the happenings outcome. This work seeks, throughout the analysis of the uses, meanings and interpretations expressed by editorials from the newspapers Correio da Manhã, Diário de Notícias, Tribuna da Imprensa e Última Hora, from the city of Rio de Janeiro, to affirm that the need to maintain the country under the protection of legality guided the actions of opinion formers from Brazilian society, military and civil. Any action that wasn t supported by the protection of legality would face strong resistance in the most diverse sectors of society. The concept of legality went through re-significations, but was always present in the speech of political actors involved in these episodes.