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Related to interest group: pressure group
A group of persons working on behalf of or strongly supporting a particular cause, such as an industry or an item of legislation.
a group of people drawn or acting together because of a common interest, concern, or purpose.
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|Noun||1.||interest group - (usually plural) a social group whose members control some field of activity and who have common aims; "the iron interests stepped up production"|
social group - people sharing some social relation
special interest - an individual or group who are concerned with some particular part of the economy and who try to influence legislators or bureaucrats to act in their favor
vested interest - groups that seek to control a social system or activity from which they derive private benefit