Interest group

An interest group (also called pressure group or Advocacy group) is a group whose members have the same concerns about a political issue, and try to influence the public policy that impact those concerns. In other words, it is an organized group of concerned citizens who advocate policy change. Interest groups often engaging in lobbying to advance their cause. Interest groups can be insider pressure groups or outsider pressure groups.

The lobbyists of small radical groups which attempt to advance their own interests at expense of common good and public welfare camouflage themselves as so called "experts."