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A social movement is a loosely organized effort by a large group of people to achieve a particular goal, typically a social or political one. This may be to carry out, resist or undo a social change. It is a type of group action and may involve individuals, organizations or both. Definitions of the term are slightly varied. Social movements have been described as "organizational structures and strategies that may empower oppressed populations to mount effective challenges and resist the more powerful and advantaged elites". They represent a method of social change from the bottom within nations.