Multiple affiliations play an important role in integrating different areas of a movement. To belong to the same movement Organizations (just as, more generally, to organizations of other types) facilitates personal contact and the development of informal network which, in turn, encourage individual participation and the mobilization of resources. Personel contacts are also instrumental in linking organizations to each other. As happens in economic organizations (Stokman et al. 1985; Mizruchi and Schwartz 1987), political organizations are often connected by the fact that they share certain activis; or else by personal relationships and friendships among their members and leaders.