1. economic interest groups. This category includes business groups, trade organizations, professional associations, and labor unions. Examples include the Business Roundtable, the American Medical Association, and the United Farm Workers of America.
2. citizen groups, many of which claim to promote the public interest. Some of these groups may also be motivated by a particular ideology or set of issues.
3. Environmental groups, such as the Sierra Club, belong in this category, as does the American Civil Liberties Union (ACLU). Some single-issue groups, such as Students Against Destructive Decisions (SADD), also fit in this category.
4. Government interest groups exist at every level of government. They include groups like the National Governors Association and groups that represent mayors or city managers. Public employee unions, like the National Education Association (NEA), also belong in this group.
5. foreign policy interest groups, 6. nationality groups, and religious organizations.