Lobbying and political interest groups occupy an ambivalent place in advanced democracies. Lobbying is viewed with suspicion, but is also a critical avenue for voices in policy debates. This insightful book injects a new sociological understanding of politics and policy. Interest groups help set political agendas, provide support to policymakers, and mobilize resources around issues. Interest groups are also the means by which individuals and organizations achieve advantage over others in social and economic life. The book incorporates theory and research about interest groups into political sociology's approach to issues of power, inequality, and public policy. As the book convincingly reveals, a sociological understanding of lobbying and interest groups illustrates the edges and boundaries of representative democracy itself. Using case studies and data, and organized by topics such as influence, collective action, representation, and inequality, the book is a critical resource for students of policymaking and political sociology.