In Italian Workers of the World, a distinguished roster of contributors examines how the reception of immigrants in their new countries shaped their sense of national identity and shaped the multiethnic states where they settled. Argentina and Brazil welcomed Italian migrants as a civilizing influence, and these immigrant workers played an instrumental part in establishing and leading movements committed to labor internationalism. In the United States, by contrast, the American Federation of Labor's hostility to socialism, internationalism, and unskilled laborers fueled distrust and xenophobia that steered Italian immigrants into ethnically mixed unions like radical Industrial Workers of the World. Essays also focus on specific topics ranging from the work of republican Garibaldians in South America to antifascist currents among Italian migrants in France and the United States, and from a 1912 textile strike in Lawrence, Massachusetts, to Mussolini's invasion of Ethiopia. Contributors: Antonio Bechelloni, Fernando J. Devoto, Pietro Rinaldo Fanesi, Donna R. Gabaccia, Mirta Zaida Lobato, Fraser M. Ottanelli, Carina Frid de Silberstein, Michael Miller Topp, Angelo Trento, Nadia Venturini, and Elisabetta Vezzosi