Interest Group
Organization of people whose members have a common cause for which they seek to influence public policy, without seeking political control.
"interest group, also called special interest group or pressure group, 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.
All interest groups share a desire to affect government policy to benefit themselves or their cause. It could be a policy that exclusively benefits group members or one segment of society (e.g., government subsidies for farmers) or a policy that advances a broader public purpose (e.g., improving air quality). Interest groups are a natural outgrowth of the communities of interests" [1]
[1] Britannica Concise Encyclopedia, http://www.britannica.com/EBchecked/topic/290136/interest-group
