Agovernment that is not constrained by legal limits and also seeks to eliminate those organized social groups that might challenge or limit their authority is known as

Totalitarianism

Explanation: Totalitarianism is a form of government where the head of government maintains absolute control over the rulings, affairs and administration of all sectors of governance. Totalitarian government is characterized by complete disregard of law, absence of Democratic freedom, extensive military dominance, complete control over economic decision and resources. It is widely regarded as the most complete form of authoritarian rule. Adolf Hitler, ruler of the German Nazi is regarded as one of most notable dictator of complete totalitarian regime the world has ever seen.

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