Stefan Lux was a Jewish Czech journalist, who committed suicide in the general assembly room of the League of Nations during its session, July 3, 1936, to alert the world on the perils of German antisemitism. After shouting "C'est le dernier coup" ("This is the final blow") he shot himself with a revolver.
The Vatican did not give a permission to shoot the film in their buildings. After searching a scenery of adequate size for the scenes taking place in the Vatican, Costa-Gavras finally chose Europe's largest building, the House of the People (Casa Poporului) in Bucharest. Some of the outdoor scenes were shot in Mogosoaia Palace, some fourteen kilometers northwest of Bucharest.