He also gave a number of lectures in the United States and abroad on the dangers of Fascism. In The Historian, David H. Culbert described Swing as a liberal who voted for Norman Thomas in 1926 and supported Franklin D. Roosevelt during World War II.
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.