Dr Sarah Marsden introduces her paper A Social Movement Theory typology of militant organisations: Contextualising terrorism. Terrorism and Political Violence. [Online first] doi: 10.1080/09546553.2014.954039 http://www.tandfonline.com/eprint/KjVBTCwDCNPeP96RuVzh/full#.VGxb0Ic2I0M