Throughout its history the Irish Republican Movement has been beset by splits. The former paramilitary and author Brendan Behan famously quipped that, ‘The first thing on the agenda was always the split.’ In this in-depth research Morrison analyses the splits through his extensive range of interviews with leadership and rank and file members of the political and paramilitary wings of the Movement. This timely analysis shows how the splits have both aided the politicization of Sinn Fein and the Provisional IRA while in parallel they have brought about the recent intensification of dissident Republican paramilitary activity. He charts the rise of groups including the Real IRA, Continuity IRA and the newly emerging ‘New IRA.’ By applying his unique process model of splits Morrison provides an insightful analysis of this long-lasting terrorist movement.