 It highlighted attendees of Will Shortz's American Crossword Puzzle Tournament, including former American president Bill Clinton and American comedian Jon Stewart.In 1944, Allied security officers were disturbed by the appearance, in a series of crosswords in "The Daily Telegraph", of words that were secret code names for military operations planned as part of Operation Overlord.Some cryptologists for Bletchley Park were selected after doing well in a crossword-solving competition.