What is Authoritarian Personality?

Legal Definition
Authoritarian personality is a state of mind or attitude characterized by belief in absolute obedience or submission to one's own authority, as well as the administration of that belief through the oppression of one's subordinates. It usually applies to individuals who are known or viewed as having an authoritative, strict, or oppressive personality towards subordinates.
-- Wikipedia
Legal Definition
When a person becomes too attached to ideas of power. They can be rigid, prejudice, and act like a tyrant. If the person encounters a weaker party this is especially present.