As the story of Antonio, with which we opened this chapter, illustrated well, the importance of social networks for collective action in movements goes beyond their support of individual activism. On the contrary, by participating in the life of a movement and, in particular, in that of its various organizations, activists create new channels of communication among them and increase the scope for promoting common campaigns. Links founded on multiple allegiances are also important as they create channels of communication between movement and their environment. There are, of course, exclusive allegiances in which a single organizations monopolizes the commitment and the affective investment of its individual members; but the inclusive model is more common