Examples of interest group organizations: Below are links to several national interest group organizations. It provides a broad array of examples, but the list does not by any means include all existing organizations. The organizations are classified by their type of membership, the two broad types being economic groups and public interest groups. Economic groups can be classified into business, labor, professional/occupational, and "other"--students, seniors, and various types of public officials all have interest group representatives. Public interest groups, sometimes called citizen groups or issue groups, can be classified according to the particular kinds of issues they address.