This article investigates the criminalization of travestis. The study unveils the mechanisms and articulations between the legal and illegal dimensions that produce this phenomenon. The methodology adopts an ethnographic approach based on participant observation, stemming from engaged practice in advocacy and activism alongside travestis. The methodological framework encompasses the documentary analysis of criminal proceedings and the use of field diaries for the elaboration of analytical scenes. Based on the reconstruction of the fieldwork, the paper maps the articulation movement that produces the criminalization of travestis. The results demonstrate that prostitution and precariousness intertwine the networks that produce criminalization. It is concluded that crime is not an abstract entity, but rather a construction effected in local and situated processes, mobilized by multiple actors and sustained by gender norms.