interest 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 causes. Their goal 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). They attempt to achieve their goals by lobbying—that is, by attempting to bring pressure to bear on policy makers to gain policy outcomes in their favour.
Encyclopedia Britannica
social movement: a loosely organized but sustained campaign in support of a social goal, typically either the implementation or the prevention of a change in society’s structure or values.
Encyclopedia Brittanica