Injustice is perceived, experienced and articulated. Social movements, and their constitutive parts, frame and re-frame these senses of injustice. Two often-overlapping accounts of social movements are in focus in this chapter. Human geography has been flooded with movement-based analyses of environmental justice (EJ). Sociology (more appropriately political sociology) has provided insight into social movements in the form of 'contentious politics' (CP). Building on both sets of literature, this chapter seeks to advance thought in human geography through a detailed exploration of master and collective action framing. It argues, firstly, that framing analysis challenges activist researchers to retain 'spatial constructs' as their central focus, rather than discourse. It calls, secondly, for us to unbind injustice as much as justice in our analysis of framing. And lastly, it demands a multi-spatial perspective on framing beyond simply scalar accounts.