A court order directing a government official or entity to perform a specific duty required by law when they have failed or refused to do so. It compels action rather than prohibiting it, typically used when someone has a clear legal right to government performance.
From Latin 'mandamus' meaning 'we command.' Developed in English common law as a royal prerogative writ to compel inferior courts and officials to perform their duties. The concept transferred to American law as a tool for judicial supervision of executive action.
Mandamus was the weapon that established judicial review in America—the famous Marbury v. Madison case began as a mandamus petition asking the Supreme Court to force Secretary of State James Madison to deliver judicial commissions. Though Marshall denied the writ, he used the case to declare the Court's power to strike down unconstitutional laws, fundamentally shaping American government. Today, mandamus remains a crucial tool for forcing government agencies to follow the law.
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