Types of Interest Groups. A. Economic Interest Groups. Over half of the lobbies operating in Washington represent corporate and industrial interests. Once very powerful, organized labor groups are declining in influence. Other Economic Interest Groups.
Many professional groups are also organized, for example, lawyers, doctors, and farmers.
B. Public Interest Groups. These groups come together to secure collective action from government. Common Cause is one of the most prominent public interest groups. C. Government Interest Groups. The National Conference of Mayors and the National Governors' Association are two examples of government interest groups.