The World Socialist Movement (WSM) is an international organisation of socialist parties created in 1904 with the founding of the Socialist Party of Great Britain (SPGB). The member parties share a common classical Marxist worldview and an adherence to socialism defined as a distinct economic system from capitalism. As a result, the parties of the WSM are held in sharp contrast to social democratic political parties and Marxist–Leninist movements. In contrast to social democratic parties, the WSM parties do not pursue social and economic reforms to capitalism, nor do they seek political office in electoral politics and they do not focus on so-called progressive causes, believing such actions to be irrelevant to their fundamental goal of socialism. In contrast to Marxist–Leninist communist