This document discusses interest groups and their role in the political process. It defines interest groups as organizations that aim to influence government policy. It notes that interest groups differ from political parties in that their main goal is to influence decisions rather than gain control of government offices. The document also discusses reasons for the formation of interest groups, including protections under the first amendment, decentralization of government, and weakness of political parties. It outlines various types of interest groups including business, labor, professional, and government employee groups.