The celebrations of the twenty-five years of Public-Interest Civil Action Law (Lei da Ação Civil Pública), considered as an important milestone in the process of redemocratization of the Country and valorization of citizenship, have propelled this work. Gathering first class specialists of legal area, it presents expressive manifestations of the most different aspects, contributing for a better knowledge of this important instrument of validation of institutional warranties provided in the Federal Constitution of 1988. The deviations of public civil action that negatively affects its image, the last amendments it went through, its legal, social and political senses and consequences are some of the approached themes.