With its broad spectrum of scholarship on interest groups past and present, Interest Group Politics brings together noted political scientists to provide comprehensive coverage and cutting-edge research on the role and impact of interest groups in U.S. politics, all geared to an undergraduate audience. In the wake of the Citizens United decision and the growth of lobbying into a multi-billion dollar industry, this trusted classic provides students with a guide to the influence and reach of interest groups. The Ninth Edition offers 15 new contributions on a variety of topics including organized labor, the LGBT movement, religious lobbying, the Tea Party, the tobacco industry, the role of “dark money” in campaign funding, the profession of lobbying, and advocacy and inequality. Each chapter is written by an expert in the field and carefully edited for clarity and cohesion by the editors Allan J Cigler, Burdett A. Loomis, and Anthony J. Nownes.