When World War II began in 1939, Dilling was part of the national network of anti-Semitics, anti-Communists, and Nazi sympathizers such as Father Charles Coughlin, Reverend Gerald L. K. Smith, Reverend Gerald Winrod, and William Dudley Pelley. Material generated by Nazi organizations in Germany to inspire race hated and exploit dissatisfaction in the United States found its way into Dilling's publications. She spoke at rallies hosted by the leading U.S. Nazi organization, the German-American Bund, and had traveled to Germany, pronouncing the country as flourishing under Hitler.

Dilling called for appeasing Germany; she blamed the war on Jews and Communists and accused the Roosevelt administration of being controlled by Jewish Communists. ... After Pearl Harbor, Dilling resisted wartime rationing and denounced the Allies.

Dilling spent the remainder of her life publishing broadsides against the north Atlantic Treaty Organization [Old Right isolationists opposed the treaty], foreign aid, the income tax, racial mixing, the fluoridation of water, the Vietnam War, and the war on poverty. She had long been dismissed as a crank before her death in 1966, although some of her literature continues to be cited in right-wing circles.