How do the organizational structure and rules of political parties affect political engagement and its reproduction? Analyzing Uruguay's mass-organic Frente Amplio party, this book illustrates how organizational rules that give grassroots members a voice help reproduce activism. It will interest scholars and students of both Latin America and comparative politics.

Political parties with activists are in decline due to various external shocks. Societal changes, like the emergence of new technologies of communication have diminished the role and number of activists, while party elites increasingly can make do without grassroots activists. However, recent scholarship concerning different democracies has shown how activism still matters for representation. This book contributes to this literature by analyzing the unique case of the Uruguayan Frente Amplio (FA), the only mass-organic, institutionalized leftist party in Latin America. Using thick description, systematic process tracing, and survey research, this case study highlights the value of an organization-centered approach for understanding parties' role in democracy. Within the FA, organizational rules grant activists a significant voice, which imbues activists' participation with a strong sense of efficacy. This book is an excellent resource for scholars and students of Latin America and comparative politics who are interested in political parties and the challenges confronting new democracies.

'This book is an exemplary study of institutional stability and continuity. The authors tell a compelling story about why and how the FA has endured as a leftist, mass-organic party despite exogenous changes and endogenous challenges.' Jennifer Cyr, Latin American Politics and Society