Dušan "Duško" Popov (born in Titel, Austria-Hungary, now Serbia) was a double agent working for the British intelligence agency MI6 during World War II under the code name "Tricycle" and for the German intelligence agency Abwehr under the code name "Ivan".Dušan "Duško" Popov (born in Titel, Austria-Hungary, now Serbia) was a double agent working for the British intelligence agency MI6 during World War II under the code name "Tricycle" and for the German intelligence agency Abwehr under the code name "Ivan"....more