In December 2010, relatives of more than seventy people killed or disappeared during Mexico's so-called war on drugs met in a location outside Chihuahua City. This chapter looks at the evolving processes of these movements, primarily in relation to the Movement for Peace and Justice with Dignity (MPJD) and the mobilisation around the families of the forty-three disappeared Ayotzinapa students. It focuses on two aspects of these struggles: first, the role of human rights claims as scenes of contestation; and second, how digital communications, particularly social media, have formed part of the movement's practices as well as the wider communications environment. These two aspects of movement activity shine a light on the development of the repertoire of collective action of social movements engaged in contentious politics, the political opportunities and constraints of the war on drugs in the context of Mexico's political transition and the changing media environment.