Wilhelm Liebknecht
He studied law, but never graduated, at the University of Naples, while reading extensively on historical materialism. His ideas were publicized at the University of Rome towards the end of the 1890s by Professor Antonio Labriola. Croce was well acquainted with and sympathetic to the developments in European socialist philosophy exemplified by August Bebel, Friedrich Engels, Karl Kautsky, Paul Lafargue, Wilhelm Liebknecht, and Filippo Turati.