Value-form
The Western Left academics are nowadays very happy to talk about "varieties of capitalism", but talking about "varieties of socialism" remains almost an absolute "no-no". Most Marxists continue to believe in "only one" (Marxian) socialism: either that, or nothing at all. "Either" a society or movement conforms to the true concept of socialism, "or" it does not; and if it does not, it "cannot be" socialism. However, precisely "because" there are many different Marxist beliefs about socialism, Marxists cannot agree among themselves whether Soviet-type societies were socialist, capitalist, or something else. Some countries meet with the moral expectations which Marxists have, and others do not.Originally Marx and Engels themselves had heckled the advocates of "true socialism", but later Friedrich Engels and Karl Kautsky promoted Marxist socialism as the one and true "scientific socialism" within the Socialist International. When he was 43 years old, Lenin stated: "The Marxist doctrine is omnipotent because it is true". Lenin's Communist International (a deliberate split with the social democrats) adopted Marxist socialism as its official political doctrine.
Classical Marxism
Karl Marx (5 May 1818, Trier, Germany – 14 March 1883, London) was an immensely influential German philosopher, sociologist, political economist and revolutionary socialist. Marx addressed a wide range of issues, including alienation and exploitation of the worker, the capitalist mode of production and historical materialism, although he is most famous for his analysis of history in terms of class struggles, summed up in the opening line of the introduction to "The Communist Manifesto": "The history of all hitherto existing society is the history of class struggles". The influence of his ideas, already popular during his life, was given added impetus by the victory of the Russian Bolsheviks in the 1917 October Revolution and there are few parts of the world which were not significantly touched by Marxian ideas in the course of the twentieth century.