Based on an ethnographic study of mobilisations of the Comorian diaspora in Marseille during political and cultural events, the book examines communitarisation in relation to three thematic areas, namely spaces, cultural markets and local politics. Drawing on Foucault’s concept of the dispositif, the author analyses mobilisations of postcolonial diaspora as part of a dispositif of communitarisation, that is, a set of discourses, practices, institutions and subjectivations of diasporic community. She argues that constructions of ‘community’ are both shaped by and shape ethnicised biopolitics, expressed by modes of governing diasporic groups along ethnicised divisions and a marking of ethnicised communities as the Other of the French Republic. The performativity of a Comorian community brought into being through political, cultural, economic and customary practices also shows how Comorian communities govern themselves along ethnicised categories, at the intersection with generation, gender, age classes, locality and class. Communitarisation processes as part of ethnicised (self-)governing reveal postcolonial power relations in France as well as practices of negotiation and contestation on the part of Comorian communities. This book will be of interest to scholars in the fields of critical diaspora studies, critical ethnography, discourse and dispositif analysis, postcolonial politics, and the African diaspora.