According to the Cambridge and Merriam-Webster dictionaries, a person who takes power by force and rules with total authority is a dictator. A dictator is not elected by the people, and extends his powers into the private lives of the people. He usually enjoys a cult of personality throughout the nation. An example of dictator would be Hitler in Germany between 1933 and 1945.
You should bear in mind that there are two other words which could fit this definiton, with some nuance:
- if this ruler uses its unlimited power unfairly and/or cruelly, it is a tyrant;
- if this ruler came to power through elections which he rigged, and simply rules without any political opposition, it is an autocrat.
It was through Propaganda and Silencing of people lead to people denying the fact that the holocaust was happening, and only rumors about concentration camps where among ally troops until they finally liberated them.
The holocaust was the mass genocide of jewish people by the nazi party so the so called "superior" german race could rule over Europe. Nazis beliwved jews were the rats that were investing Europe.
