 In 1930 he published, in French, "Socialisme Libéral".The book was at once a passionate critique of Marxism, a creative synthesis of the democratic socialist revisionism (Bernstein, Turati and Treves) and of classical Italian Liberalism (Benedetto Croce, Francisco Saverio Merlino and Gaetano Salvemini).But it contained also a shattering attack on the Stalinism of the Third International, which had, with the derisive formula of "socialfascism", lumped together social democracy, bourgeois liberalism and fascism.