The poor and disadvantaged are widely seen as having weak organizations and low rates of participation in community associations, impeding their political representation and economic advancement. Many policy initiatives aim to build civic participation among the disadvantaged by funding local community associations. Taking advantage of random assignment in a program supporting women's community associations in Kenya, we find little evidence that outside funding expanded organizational strength, but substantial evidence that funding changed group membership and leadership, weakening the role of the disadvantaged. The program led younger, more educated, and better-off women to enter the groups. New entrants, men, and more educated women assumed leadership positions. The departure of older women, the most socially marginalized demographic group, increased substantially. The results are generalized through a formal model showing how democratic decision making by existing members of community associations can generate long-run outcomes in which the poor and disadvantaged either do not belong to any associations or belong to weak organizations.