The First International was the first international political organization of workers and a product of the combination of Marxism and the international workers' movement. During this period, Marx clearly advocated and supported the basic position of standing fi rmly with the proletarian economic struggle, fully affirmed the important value of the proletarian economic struggle, and deeply analyzed the dialectical relationship between the proletarian economic struggle and political struggle. He also clarifi ed that the economic struggle could be a powerful lever for political struggle and social revolution, and called on the world's proletariat to combine economic and political struggles. These views, thoughts, and propositions are important components of Marxist class theory, pointing out the correct direction for the international workers' movement. Systematically sorting out Marx's theory and practice of proletarian economic struggle during this period, therefore, is of very important theoretical value and practical signifi cance.