This article argues that much recent scholarship devoted to the concept of transnationalism and to the category of transnational communities is misguided. Such scholarship neglects to acknowledge the distinctions between the transnational and the diasporic, in particular the qualities and features of certain ethno-diasporas that set them apart. The article argues that “scholars need on all occasions to acknowledge, first, the difficult work that dispersed entities must conduct in order to persist” and must recognize the very different capacities possessed by, say, Latino or Muslim transnational networks and communities, on the one hand, and Jewish, Armenian, or Indian ethnonational diasporas, on the other. It also affirms that scholars must acknowledge all features of the behavior of such communities, including “the possibility that some members of these entities may be guilty of creating difficulties, unrest, conflicts, [even] terrorism,” which does not mean that scholars need neglect their obligation to emphasize the immense contributions of various dispersions to the economies and cultures of their hostlands.