The Great Dictator (1940) is a classic Charlie Chaplin film that follows the journey of a Jewish barber who is mistaken for a dictator of a totalitarian state. The film culminates in a powerful and emotional ending as the barber stands up to the dictator and speaks out
From Wikipedia
The Great Dictator is a 1940 American political satire black comedy film written, directed, produced by, and starring Charlie Chaplin. Having been the only major Hollywood filmmaker to continue to make silent films well into the period of sound films, Chaplin made this his first true sound film.