No not all dictators in the last century where right wing.
Hitler and Stalin and Mao where left wing. Only two right wingers and both turned over power while they where still alive to Democratic governments in their nations. That action is not the action of a left winger. A left winger murders all of his competition he can get his hands on and does not give up power until he is murdered or dies. See north Korea.
Franco was a fascist and fascism is a creation of the Left.