The three major workers' movements in Europe, namely, the two armed workers' uprisings in Lyon, France, the workers' charter movement in Britain, and the textile workers' uprising in Silesia, Germany, marked that the proletariat stepped onto the historical stage.

Marx and Engels linked theoretical research with the struggle for proletarian liberation, and founded scientific socialism on the basis of absorbing the excellent cultural heritage of mankind. The publication of the Manifesto of the Productive Party marks the birth of scientific socialism.