Marx's influence during his life was not great. After his death it increased with the growth of the labour movement. His ideas and theories came to be known as Marxism, or scientific socialism, which constitutes one of the principal currents of contemporary political thought. His analysis of capitalist economy and his theories of historical materialism, the class struggle, and surplus value have become the basis of modern socialist doctrine. Of decisive importance with respect to revolutionary action are his theories on the nature of the capitalist state, the road to power, and the dictatorship of the proletariat. These doctrines, revised by most socialists after his death, were revived in the 20th century by Lenin and, as developed and applied by him, constituted the core of the theory and practice of Bolshevism and the Third International.
