"I'm still not sure that the German-American Bund would have wanted to risk exposure of anything secret at the time (they had the facade of trying to avoid any direct connection with Hitler)"
True, but I didn't refer to the Bund as a whole, but a cell within the Bund. Notwithstanding, there was certainly Bund collusion with Nazi agitators, and recruitment from it to the Nazi cause. Most of the offenders were eventually rounded up, but some did choose to go to Germany to enlist. Some American banks and companies were doing business with Nazi Germany via diverse routes and means right throughout the war.
