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Marx and Engels first became aware of Professor Dühring with his December 1867 review of Capital, published in Ergänzungsblätter. They exchanged a series of letters about him from January-March 1868.
He was largely forgotten until the mid-1870s, at which time Dühring entered Germany's political foreground. German Social-Democrats were influenced by both his Kritische Geschichte der Nationalökonomie und des Sozialismus and Cursus der Philosophie als streng wissenschaftlicher Weltanschauung und Lebensgestaltung. Among his readers were included Johann Most, Friedrich Wilhelm Fritzsche, Eduard Bernstein – and even August Bebel for a brief period.
In March 1874, the Social-Democratic Workers’ Party paper Volksstaat ran an anonymous article (actually penned by Bebel) favorably reviewing one of Dühring's books.
Frederick Engels is one of founders of Marxism