At the beginning of Brazil's First Republic (1889–1930), the clandestine lottery called the jogo do bicho or ‘animal game’, which still exists today, gained enormous popularity in Rio de Janeiro, the city of its origin, and soon in the whole of Brazil. Reconstructing the spread and persecution of the jogo do bicho during its first decades reveals the social process of urbanisation evident in the daily, often informal and quasi-legal, interactions between the state and popular commerce in Latin America. The ambivalent official stance and public sentiment that developed toward this lottery suggest that ‘law and order’ concerns in themselves do not explain the criminalisation of vernacular practices.