Italian criminologist, socialist, and student of Cesare Lombroso. However, whereas Lombroso researched the physiological factors that motivated criminals, Ferri investigated social and economic factors. Ferri was the author of Criminal Sociology in 1884 and the editor for Avanti, a socialist daily. His work served as the basis for Argentina’s penal code of 1921. Although at first he rejected the Italian dictator Benito Mussolini, after his rise to power he became one of its main supporters outside the Fascist Party.