In Moscow he was often aware of being followed and several times had people asking to buy his tie. There was also the true story of a flight engineer on the very first BOAC flight to Moscow who was convinced his hotel bedroom was bugged. He felt something lumpy under the carpet, rolled it back and found a metal object screwed to the floor. He unscrewed it and heard a massive crash as the chandelier in the room below fell to the floor.
Full story here: (Though it has been attributed to a Canadian basketball team):
http://betteronacamel.com/Russia-USS...rd-Garvie-1970