Just days after Germany invaded Poland in 1939, Charlie Chaplin was already shooting The Great Dictator, which came out in the following year. Chaplin had been troubled by the rise of Hitler through the Thirties, as well as how other nations dealt with him. His film was not only a broad comic swipe at Hitler and fascism, but a moving message in its own right - particularly for the speech that Chaplin's character, a Jew who is mistaken for a madman, gives at the climax of the film.
The speech, in which Chaplin praises technology as a potential force for good but decries "these unnatural men, machine men, with machine minds and machine hearts." The speech has been quoted often (it's in this American Rhetoric collection) and has been making the rounds lately, perhaps in the spirit of the 9/11 anniversary.