His two later books detailed his sense of the system that was emerging to replace capitalism, which he believed to be fascism.
The Coming American Fascism in 1936, detailing the system's substructure, and
The Dynamics of War and Revolution in 1940, on the
superstructure. Dennis argued that he was merely examining fascism and predicting its coming to the U.S., not actually advocating it. His readers and associates assumed he was indeed an advocate. He never tried to create or join a fascist party. He viewed Hitler as unimpressive and reliant on political showmanship, preferring more intellectual Nazis such as
Joseph Goebbels,
Alfred Rosenberg,
Rudolf Hess, and
Hermann Göring. In her 2023 book,
Prequel,
Rachel Maddow wrote of Dennis's visit to
Nuremberg for the 4th annual
Nazi party congress on September 8, 1936, "Dennis's biographer, Gerald Horne, would later write 'America's most outspoken fascist symbolically melted into the Nazi mass.'" He was an isolationist, and therefore expressed staunch opposition to American involvement in a war against Nazi Germany. He tried to join the U.S. Army during World War II, but the Army rejected him after the media ran stories about him. He often described himself as rational and unemotional.
Anne Morrow Lindbergh strongly disagreed, describing him as "sensitive" and having "been badly hurt." ==Sedition trial==