Which organization is a ruler who has full control in a country?

A ruler who has full control in a country is often referred to as a dictator. This type of leadership is typically characterized by the concentration of power in one individual or a small group, with little to no political pluralism or democratic processes. Dictatorships can arise through various means, including military coups or authoritarian regimes, and often suppress dissent and limit individual freedoms. Examples include historical figures like Adolf Hitler in Germany or Kim Jong-un in North Korea.