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In page State (polity):

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Marx and Engels were clear in that the goal of communism was a classless society in which the state would have "withered away", replaced only by "administration of things".[1] Their views are found throughout their Collected Works, and address past or then-extant state forms from an analytical and tactical viewpoint, but not future social forms, speculation about which is generally antithetical[citation needed] to groups considering themselves Marxist but who – not having conquered the existing state power(s) – are not in the situation of supplying the institutional form of an actual society. To the extent that it makes sense, there is no single "Marxist theory of state", but rather several different purportedly "Marxist" theories have been developed by adherents of Marxism.[2][3][4]