"Casablanca": One way to stand up against fascism.

Casablanca (USA 1942)

Set and filmed during the Nazi regime in French Vichy-controlled Casablanca, this scene stands out, and is known as "The Battle of the Anthems" - between "Wacht am Rhein" sung by Nazi officers and the "Marseilleise" sung by refugees and even Vichy collaborators.

Much of the emotional impact of the film, for the audience in 1942, has been attributed to the large proportion of European exiles and refugees who were extras or played minor roles, in addition to leading actors Paul Henreid, Conrad Veidt and Peter Lorre. These were amongst others Louis V. Arco, Trude Berliner, Ilka Grünig, Ludwig Stössel, Hans Heinrich von Twardowski, and Wolfgang Zilzer.

A witness to the filming of the "duel of the anthems" sequence said he saw many of the actors crying and "realized that they were all real refugees". Harmetz argues that they "brought to a dozen small roles in Casablanca an understanding and a desperation that could never have come from Central Casting". Even though many were Jewish or refugees from the Nazis (or both), they were frequently cast as Nazis in various war films, because of their accents.

It's an incredibly beautiful, still relevant movie, even today.
https://en.wikipedia.org/wiki/Casablanca_(film)