In the social reality, law’s mobilization will translate by the resort to the action or reference models put forward by legal standards. Law’s mobilization intervenes in a local, concrete, specific and historically situated context (Ewick et Silbey, 1998). This paper presents the results of a research that sought to document the relation between “low-skilled” temporary foreign workers and labour law. Formally, these workers can benefit from the protection of labour law despite their migratory status. Many studies have however shown that they are generally less likely to report the violation of their labour rights. Does labour law constitute a useful bastion for these workers? Using a methodology involving a field study, this study pursues two objectives. On the empirical level, it allows to shed light on the impact of the singular employment system of these workers on their mobilization of labour law’s protections. Such mobilization is neither contingent nor predetermined; it depends on the constraints and on the opportunities arising from the employment system. Our research also reveals that strategies elaborated by actors who are not, from a legal perspective, parties to the employment relationship also have a significant impact on the way these workers take advantage of labour law’s resources; such impact largely depends on the power these actors have in the employment system.