This article reviews Mexican Supreme Court decisions concerning the legal status of juntas de conciliación y arbitraje (state labour boards of conciliation and arbitration) between 1917 and 1924. During this period the Court played an important role in legitimising these administrative boards, which have since become a constituent part of Mexico's state–labour regime. This examination of the Court's decisions shows how judge-made law contributed to the evolution of industrial relations in the country in the early 1920s. Furthermore, the article's discussion of the connection between the Court's evolving case law and its changing membership in this period indicates how its legal decisions were sensitive to political changes. This presents an early instance of the more recent trend toward the judicialisation of politics in Latin America.
