David,
I will have to find the book and the history show I just saw recently. The greatest Intelligence Operation ever conducted in the USA was done by British Intelligence during WW2 in order to convince America to enter the War and it was done with FDR's consent and against FBI director Hoover's vehement objections. And it still has ramifications to this very day. The operation was massive and the total extent of operation was never truly known. It has been in the papers fairly recently and there was a lot of UK help in the production of the TV show so you may have seen what I am talking about.