The third program, Loyal Americans, chronicles the generational clash between the first wave of Italian immigrants and their children. The Immigration Act of 1924 imposed rigid restrictions and radically reduced the number of immigrants coming to America from southern Europe. Many Italians returned home, but their children began to reach out to America and embrace the institutions that their parents had rejected. Some were successful beyond their wildest dreams. Joe DiMaggio, the son of a fisherman, became one of the greatest players ever to grace a baseball field. Fiorello LaGuardia embarked upon a political career that would later see him serve as mayor of New York City for twelve years. In the field of entertainment, a young singer called Frank Sinatra was rapidly making a name for himself. Yet during Prohibition, Italian- Americans also moved into the highest echelons of organised crime. World War II saw the loyalty of Italian-Americans come under scrutiny as Mussolini's Italy was officially declared an enemy. Many were forced to choose between their homeland and their adopted country, sometimes with dreadful consequences.