Films about corrupt politicians, dictators, etc.

Every kind of politician from those who "only" take bribes to dictators who commit murders. Any and all who put themselves ahead of the people they represent or govern.  Any country, any time.

Three to start:

ALL THE KING'S MEN (1949), based upon the life of Huey Long, governor of Louisiana

RICHARD III (1955), from Shakespeare's play about British King Richard III