Exploring the history and religious community of a group of Muslim Sufi mystics who came largely from socially marginal backgrounds in colonial French West Africa, this study shows the relationship between religious, social, and economic change in the region. It highlights the role that intellectuals - including not only elite men, but also women, slaves, and the poor - played in shaping social and cultural change and illuminates the specific religious ideas on which Muslims drew and the political contexts that gave their efforts meaning. In contrast to depictions that emphasize the importance of international networks and anti-modern reaction in twentieth-century Islamic reform, this book claims that, in West Africa, such movements were driven by local forces and constituted only the most recent round in a set of centuries-old debates about the best way for pious people to confront social injustice. It argues that traditional historical methods prevent an appreciation of Muslim intellectual history in Africa by misunderstanding the nature of information gathering during colonial rule and misconstruing the relationship between documents and oral history.