I would say tyranny.
Basically, tyranny means that it is cruel, harsh, and brutal. Other definitions state that it is a government, king, or ruler that has complete power. One definition that goes perfectly with the world is a cruel dictator. Tyranny is a word that you would hear a lot if a war had started, and it has been in recent wars. If you want an example of tyranny, think of the book that was wrote about Hitler, "Hitler: A Study in Tyranny."