This article examines how labour law contributes to labour resistance in Vietnam through an empirical case study of the ‘core workers’ in Đồng Nai Province. These core workers are factory workers who have undergone legal training and who provide legal aid to factory workers in need. They have, at the same time, deployed their legal knowledge to demand access to justice for themselves and the factory workers. This article demonstrates that the core workers’ legal consciousness is shaped by their mobilization of the law and their own workplace experiences. It then investigates in detail a core worker’s engagements with individual and collective disputes, and discusses his views on legal aid, labour law, and workplace relationships. This article argues that the core workers’ resistance is not only a fight against illegal practices, but that it also embodies a call for the management’s moral obligations towards its workers.