This article analyzes the importance of postal correspondence as a communication tool for organizations and networks of dissident sexualities throughout the Brazilian dictatorship (1964-1985). For this investigative challenge, we use three documentary collections from the Edgard Leuenroth Archive (ael/Unicamp): the folders of the group somos, the Grupo de Ação Lésbico Feminista (galf) and the group Outra Coisa. Through the letters sent to these groups, it is possible to perceive the capillarity of their political action, and the importance of their action for people from many regions of the country, especially between 1978 and 1985. These letters also make it possible to understand the different subjectivities, the traumas experienced by people and the articulations between groups at the end of the dictatorship in Brazil.