Ex parte Quirin
Ex parte Quirin, 317 U.S. 1 (1942), was a unanimous decision of the United States Supreme Court upholding the President's authority to convene military commissions for the trial of enemy saboteurs captured within the United States during wartime.[1][2]
The case stemmed from Operation Pastorius, a Nazi sabotage mission in June 1942 involving eight German agents who landed by submarine on beaches in New York and Florida to target American economic infrastructure.[2][1] After one saboteur defected and alerted authorities, all were arrested and charged with violating the law of war by entering the country out of uniform to conduct hostile acts.[1] President Franklin D. Roosevelt ordered their trial by a secret military tribunal rather than in federal civilian courts, prompting the petitioners—including naturalized U.S. citizen Herbert Haupt—to seek habeas corpus relief challenging the tribunal's jurisdiction.[3][1]
In a per curiam opinion issued shortly after oral arguments, the Court denied the petitions, ruling that the saboteurs qualified as unlawful enemy combatants subject to military trial under longstanding common law of war principles and the Articles of War, regardless of citizenship status.[1][3] The full opinion, released after the executions of six saboteurs on August 8, 1942, affirmed that such combatants forfeited protections afforded to lawful belligerents and could be punished accordingly without impinging on constitutional due process in the civilian sense.[1][2] The decision established a precedent for executive wartime powers over unlawful combatants, later invoked in cases involving detentions post-9/11, though it has faced scrutiny for the expedited proceedings and limited judicial review.[2][3]