Karl Marx's works consist of a series of influential writings that critique capitalism and propose a revolutionary socialist framework aimed at achieving a classless society. His most notable texts, including 'The Communist Manifesto' and 'Das Kapital,' analyze the struggles between the bourgeoisie and the proletariat, emphasizing the economic and social inequalities inherent in capitalist systems. These ideas contributed significantly to the development of modern political thought and the labor movement during a time of rapid industrialization and intellectual upheaval.