It is frequently argued that to address structural injustice, individuals should participate in collective actions organized by civil society organizations (CSOs), but the role and the normative status of CSOs are rarely discussed. In this paper, we argue that CSOs semi-perfect our shared obligation to address structural injustice by defining shared goals as well as taking actions to further them. This assigns a special moral status to CSOs, which in turn gives rise to our duty to support them. Thus, we (...) do not have full discretion when deciding whether to join collective actions or not. Under certain conditions, we can even be forced by others to do our share. (shrink)