This paper argues that we need to understand the structure of Brazil's postwar industrial economy to assess the significance of labor court cases as sources for the social history of labor. What kinds of industrial workers (in terms of industrial sector and occupation) brought grievances in the labor courts depended heavily on their place in the overall postwar economy, and the impact of any given ruling also varied depending on the industry. An analysis of the decisions of the Regional Labor Court in Rio de Janeiro from 1946 to 1964 shows that workers in strategic industries (railroads, steel, ports, streetcars) brought grievances with great regularity, which speaks to the their economic power, and these rulings often had a tremendous economic impact because they applied to large numbers of industrial workers – or at least set precedents for large numbers of workers.
These labor court rulings are rich sources to write a (Thompsonian) social history of industrial workers in postwar Brazil, but only once we incorporate the economic dimension do we appreciate the full significance of the labor law for the country's path of social and economic development.