The thesis is a sociological study of the Greenham Common Women's Peace Camp. It addresses the question of how it is possible for women to act collectively to promote social change: primarily, to resist and transform relations of male domination and female subordination, and, secondarily, to resist the forces of militarism. It highlights the importance for feminist sociology of theoretical and substantive attention to women's agency. The thesis offers an analysis of the origins of Greenham, thereby developing a critique of the gender-ignorance of previous theoretical work on social movements and arguing the importance of attention to macro-, ineso- and micro-level processes in the studying of the creation of collective politA.cal action. The particular character and ethos of Greenham as a form of feminist politics is explored, both in terms of the internal workings of the movement and in its actions confronting the outside world. The responses of the forces which were challenged by Greenham are analyzed, in order to assess its impact. Finally, the transformations in consciousness and identity experienced by women who had been involved with Greenham are discussed, contributing both theoretically and substantively to feminist understandings of women's consciousness and identity.