Wall Street was invested almost anywhere it would seem profitable. However, after WWII had started, alot of business ties were severed, like the one between Firestone and IG Farben. This is just hate-America nonsense.
This doesn't say they were investing after WWII started.. it says they were investing and helping Hitler come to power... which was prior the actual "start" of WWII.
I found this from a different site thought it was interesting...