During the 1920s, Swing migrated to the new medium of radio journalism, to which his reassuring and articulate manner was uniquely suited. After covering the 1932 presidential election, he was offered a job at CBS. Swing turned the job down and it was later given to Edward R. Murrow. Swing instead joined the Mutual Broadcasting System, where, in 1936, he began to broadcast on European affairs, emerging as a strong voice of opposition to Adolf Hitler and Fascism. As the Nazis rose in power and influence and began to threaten Europe, Mutual increased his broadcasts to five times a week. He also gave a number of lectures in the United States and abroad on the dangers of Fascism.