The research ‘The Lipstick Lobby and the Letter of Brazilian Women to the Constituent Assembly: engendering democracy and rethinking Feminist movements to shape Law and Society’ proposes to address new ways of thinking about Law from the perspective of engendering democracy, focusing on the process that culminated in the 1988 Brazilian Constitution. Considering the document of the ‘Letter of the Brazilian Woman to the Constituent Assembly’ and the Lipstick Lobby of 1987, the main hypotheses raised consist of assuming that the Feminist and women’s movements would shape Court decisions, bringing a more egalitarian interpretation. The research is divided into three parts (i) historiography and literature review on engendering democracy; (ii) study of the exchange of political ideas; and (iii) present a proposal for an interpretation of how Feminist and women’s movements and in the field of Law are relevant to rethink and improve a greater democratization of Society. Above all, it is an invitation to rethink a more inclusive History, giving weight to the actors of social movements that were present in the process of Brazilian redemocratization. Also, to reflect on the performance of vulnerable groups as a relevant part of this process and not as actors apart from civil Society.