In a period marked by repression during the military dictatorship in Brazil, when there was a worsening in the economic situation of the majority of the black and poor population abandoned by the State, social movements have managed to gain visibility for the struggle for rights and for the return or democracy. From analyzing primary sources – the Brazilian Women s Letter to the Constituents prepared by the National Council for Women s Rights (CNDM) and the Unified Black Movement (MNU) papers, including the document prepared by the Black National Convention for the Constituent Assembly –, it was possible to realize that, during the elaboration of the Constitution of 1988, the Black Women s Movement has established dialogues marked by tensions with MNU and the women who belong to CNDM in the Feminist Movement. This has promoted dialogues also marked by tensions between CNDM and MNU due to the convergence of proposals that deal with sensitive issues to the black community, black women in particular, in the Brazilian Women s Letter to the Constituents and in the demands present in the Unified Black Movement papers, with special emphasis on the document of the Black National Convention for the Constituent Assembly. These documents have influenced the rights provided for in the Constitution of 1988, which are currently threatened in times of reactionary agendas linked to the authoritarian exercise of politics.