The Captain from Cologne(1956)

Albert Hauptmann is an out of work waiter in Cologne who is often confused with a former Captain of the Nazi Army. Albert uses this to his advantage and becomes the Director of the Montan Corporation, and a member of the West German Parliament. Herr Karjanke, the real Captain, learns of Albert’s ruse, and wants to claim his "rightful" position in Parliament. But Karjanke cannot come forward until his politicking "Doppelganger" succeeds in passing an amnesty law for war criminals. When Albert is finally brought before a judge on charges of fraud, he learns that this own amnesty law does not apply to him.