From a correct Marxian point of view … all measures designed to restrain, to regulate and to improve capitalism were simply "petty-bourgeois" nonsense … True socialists should not place any obstacles in the way of capitalist evolution. For only the full maturity of capitalism could bring about socialism. It is not only vain, but harmful to the interests of the proletarians to resort to such measures.

Socialism (1922) - Epilogue (1947)