Washington Representatives StudyIncludes information about thousands of organizations involved in national politics, their organizational characteristics, and the activities they undertook in the pursuit of policy influence. This collection encompasses all organizations listed in the Washington Representatives directories for 1981, 1991, 2001, 2006, and 2011. These organizations have been classified into 96 categories based on the kinds of interests represented. Variables include organization name, membership category, founding year, and main objective, as well as number of lobbyists hired, number of amicus briefs filed, political action committee (PAC) donations made, and web-based lobbying activities.