This article takes the practice of law as a basis for an examination of the existence and the dynamics of a phenomenon referred to here as the "corporatism of the middle class", to have emerged in Brazil after the 1930 Revolution. Such a phenomenon is related to other ongoing historical processes, such as the implementation of the corporatist system for workers and the bourgeoisie, as well as the expansion of the role of the Brazilian state in society. The work focuses on the decree creating the Brazilian Bar Association (OAB) dated November 18, 1930, and developed by the provisional government. The setting up of the corporate entity was delegated to the Brazilian Lawyers' Institute (IAB), with the legislation for the OAB consolidated by decree no 22,478 of 1933.83506525