The aim of this study is to analyze the relationship between constituent power and slavery in Brazil. In an attempt to gain a substantive understanding of constituent power in Brazil, as well as the operationalization of law as a central element of racial hierarchization and violence on this soil, the methodological tools offered by law in Pretuguês and the analytical keys derived from the concept of a raciality device were mobilized, also with the intention of promoting reflections on alternative legal practices and anti-racist teaching programs. With the aim of reading the phenomenon from epistemic keys that break down legal colonialism, the premise is that the law is insufficient in the face of the racism embedded in Brazilian institutions and structures. It is assumed that the answer to the divisions promoted by the Law, especially racial ones, does not lie in the actions of the justice system, which points to occasional and intentionally unusual and fragile advances in the face of the great tensions, constraints and intra-institutional interpellations promoted. In order to carry out the research, the periodicals of the nineteenth-century black and abolitionist press were investigated, comprising the stages of surveying, cataloging, systematizing and qualitatively studying the information obtained. We also undertook a bibliographical review of issues related to the problem, with a view to proposing new paradigms for the analysis of constituent power in Brazil, from black self-inscriptions towards a new project for a Brazilian nation and proposals for expanding the dimensions of freedom, citizenship, equality and people.