The inability of the democratic parties to form a united front, the self-imposed isolation of the Communists and the continued decline of the economy, all played into Hitler's hands. He now came to be seen as de facto leader of the opposition and donations poured into the Nazi Party's coffers. Some major business figures, such as Fritz Thyssen, were Nazi supporters and gave generously[102] and some Wall Street figures were allegedly involved
https://en.wikipedia.org/wiki/Nazi_Party#Rise_to_power:_1925%E2%80%931933