The Great Dictator (1940)

The Great Dictator is a comedy film by Charlie Chaplin released in October 1940. Like most Chaplin films, he wrote, produced, and directed, in addition to starring as the lead. Having been the only Hollywood film maker to continue to make silent films well into the period of sound films, this was Chaplin's first true talking picture as well as his most commercially successful film. More importantly, it was the first major feature film of its period to bitterly satirize Nazism and Adolf Hitler.
At the time of its first release, the United States was still formally at peace with Nazi Germany. Chaplin's film advanced a stirring, controversial condemnation of Hitler, fascism, antisemitism, and the Nazis, the latter of whom he excoriates in the film as "machine men, with machine minds and machine hearts".

The film begins during a battle of World War I. The protagonist is an unnamed Jewish private (Charlie Chaplin), a barber by profession and is fighting for the Central Powers in the army of the fictional nation of Tomainia (an allusion to ptomaine poisoning), comically blundering through the trenches in combat scenes. Upon hearing a fatigued pilot pleading for help, the private attempts to rescue the exhausted officer, Commander Schultz (Reginald Gardiner). The two board Schultz's nearby airplane and fly off, escaping enemy fire in the nick of time. Schultz reveals that he is carrying important dispatches that could win the Tomainian war. However, the plane loses fuel and crashes in a marsh. Schultz and the private survive. As medics arrive, Commander Schultz gives them the dispatches, but is told that the war has just ended and Tomainia lost. Wikipedia