Fascist demagogues did have mass appeal during the financial collapse in the 30's in the US. A tremendous appeal . I believe there was a film in this regard . I am rummagiong for a titlle to a popularizinmg film . Oh yes ,The House on 92nd Street a 45 Noir classic with Lloyd Nolan depicting the Nazi spy ring and secrets of the A bomb as looming themes. My posted comment on the above URL suggest that the collapse in the 30's provided a very attractive backdrop for Fascist demagoguery.
Also The 39 Steps by Buchanan a novel has the same themes and was "reinvented in film mode by Hitchcock's film of the same title.