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The Suspension Clause of the Constitution provides: “The Privilege of the Writ of Habeas Corpus shall not be suspended, unless when in Cases of Rebellion or Invasion the public Safety may require it.” Art. I, §9, cl. 2. 

The Framers viewed freedom from unlawful restraint as a fundamental precept of liberty, and they understood the writ of habeas corpus as a vital instrument to secure that freedom. Experience taught, however, that the common-law writ all too often had been insufficient to guard against the abuse of monarchial power. That history counseled the necessity for specific language in the Constitution to secure the ...