that President Roosevelt
: * agreed that the two governments could spy on each others' citizens,
: * without search warrants, by establishing "listening posts" on each
: * others' territory.
[snip]
: *
: * According to several of the "old spies" who worked in Communications
: * Intelligence, the NSA headquarters is also the chief British espionage
: * base in the United States. The presence of British wiretappers at the
: * keyboards of American eavesdropping computers is a closely guarded
: * secret, one that very few people in the intelligence community have
: * been aware of, but it is true.
: *
: * An American historian, David Kahn, first stumbled onto a corner of
: * the British connection in 1966, while writing his book The Codebreakers.
: *
: * One indication of just how sensitive this information is considered on
: * both sides of the Atlantic is the fact that Kahn's publishers in New
: * York and London were put under enormous pressure to censor a great deal
: * of the book. In the main, Kahn simply revealed the existence of the
: * liaison relationship, but when he wrote that the NSA and its British
: * equivalent, the Government Communications Headquarters, "exchange
: * personnel on a temporary basis", he had come too close to revealing
: * the truth.
: *
: * The U.S. government told Kahn to hide the existence of British
: * electronic spies from the American public. Kahn eventually agreed
: * to delete a few of the most sensitive