Any association of individuals or organizations, usually formally organized, that, on the basis of one or more shared concerns, attempts to influence public policy in its favour
A pressure group is an organized group of people who are trying to persuade a government or other authority to do something, for example to change a law. the environmental pressure group Greenpeace. An interest group that endeavors to influence public policy and especially governmental legislation, regarding its particular concerns and priorities. a group or organization that tries to influence the opinions of ordinary people and persuade the government to do something interest group