I have read that prior to US entry into WW2 that FDR(POTUS) and Churchill(Naval Person) exchanged  messages thru the US Embassy in London.  Apparently Hitler was getting the  messages before the intended recipient.  Joseph Kennedy(Father of JFK, Bobby, Teddy and Joe)  was the US ambassador at the time.  Kennedy was an admirer of Hitler.  The article implied that Kennedy was the leak.  Does anyone have and info on this.  I have misplaced the article.