The film is obviously a satire on Adolf Hitler, represented by Adenoid Hynkel, and its story is based on Hynkel looking exactly like "a Jewish barber": both are played by Charles Chaplin. But it begins with a notice: "Any resemblance between Hynkel the dictator and the Jewish barber is purely co-incidental".
[Prologue] This is a story of a period between two World Wars -- an interim in which Insanity cut loose. Liberty took a nose dive and Humanity was kicked around somewhat
The World War 1918