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The last one comes from "Address of the Central Committee to the Communist League", 1850.
As you can see, violence was not only integral part of Marxian communism, but dictatorship and terror were core elements of Marxism.
Lenin and Stalin merely built on top of Marx and Engels writings. Lenin's "The State and Revolution" (1917) quotes them a lot and is all excited about Engels writings being a "panegyric on violent revolution".
@DissidentKitty@sunbeam.city