Friedrich Engels arguing that communism is the logical consequence of German philosophy, starting with Kant’s revolution and progressing through Fichte, Schelling, and Hegel:
“The Germans are a philosophical nation, and will not, cannot abandon Communism, as soon as it is founded upon sound philosophical principles: chiefly if it is derived as an unavoidable conclusion from their own philosophy. And this is the part we have to perform now. Our party has to prove that either all the philosophical efforts of the German nation, from Kant to Hegel, have been useless — worse than useless; or, that they must end in Communism; that the Germans must either reject their great philosophers, whose names they hold up as the glory of their nation, or that they must adopt Communism. And this will be proved; this dilemma the Germans will be forced into, and there can scarcely be any doubt as to which side of the question the people will adopt.”
Source: Friedrich Engels, “Progress of Social Reform On the Continent,” in The New Moral World, 3rd Series, No. 21, Nov. 18, 1843.