American Nazis stand in front of a banner of George Washington at New York’s Madison Square Garden in 1939. It is believed 22 000 people attended the event.
Prior to Pearl Harbor there was some support for Hitler in the United States, and even movies imported from Britain had anti-Nazi scenes edited out of them before their US release. Germany and Italy, both fascist countries at the time, made strong attempts to set up their own political branches with German and Italian Americans.
Of course, this changed totally when America was drawn into the Second World War halfway through, and anti-German propaganda movies became all the rage.