Famous curse:  there is a story that when Joseph Kennedy just before WWII used his influence as the U.S. Ambassador to the UK to prevent Jews in German held territories being granted visas (and safety) to the US, the Rebbe cursed him and his entire family for his actions - many believe that the problems of the family (down to the drunk driving accident of Patrick Kennedy) all date to that curse - does anyone have a source for that and want to place that in the story?