German-American Bund This organization as is made clear in its other name ‘Friends of the New Germany’ was very sympathetic towards the Third Reich. They received some funds from Nazi Germany and was composed of German-Americans. Get started here if you’d like to learn more about them. Fascist League of North America The Italian-American equivalent to the previous organization. Learn more here American Silver Legion I don’t know much about them other than what is in this brief article. America First Committee While not pro-Axis, the AFC was opposed to supporting the Allies as they feared it would lead to direct American involvement in the war. After Pearl Harbor this organization dissolved and encouraged support for the war. Notable members included Charles Lindbergh and Robert Wood. They weren’t fascist or sympathetic to fascism- they were merely isolationist. More about AFC; here and here