Takeaway
In short, this case upheld military-commission jurisdiction over enemy agents, including a claimed citizen, who secretly entered the United States out of uniform to commit wartime sabotage—a recognized offense of unlawful belligerency under the law of war.
In 1942, eight German-trained saboteurs traveled by submarine from occupied France and landed separately on Long Island, New York, and Ponte Vedra Beach, Florida. They carried explosives and other sabotage equipment, initially wore portions of German military uniforms while landing, then buried the uniforms and equipment and proceeded in civilian clothes. They had been directed by the German High Command to destroy American war industries and facilities.
President Roosevelt appointed a military commission to try them for violations of the law of war, aiding or corresponding with the enemy, spying, and conspiracy. His accompanying proclamation purported to subject certain enemy agents to military tribunals and to deny them access to civilian courts.
The petitioners sought habeas corpus relief in the federal district court in Washington, D.C., arguing that they were entitled to ordinary criminal trials, including indictment and jury trial. The district court denied leave to file the petitions. The Supreme Court granted certiorari before judgment, heard expedited argument, and affirmed the district court's orders while the military-commission proceedings were still underway.
Issue #1
Whether the President's proclamation and the petitioners' status as enemy aliens barred judicial review of their detention and military trial.
Holding
No. The Court could consider whether the Constitution and federal law authorized the military commission to try the petitioners.
Reasoning
The Government argued that enemy aliens, and persons covered by the President's proclamation, had no access to the courts. The Court rejected that position at least insofar as it would prevent a court from deciding whether the proclamation applied and whether the Constitution and laws of the United States permitted the military trial.
The Court emphasized that courts retain their duty, in war as well as peace, to preserve constitutional safeguards. It therefore reached the central legality of the commission's jurisdiction, although it found no need to decide every broader contention concerning the proclamation's effect.
Issue #2
Whether Congress and the President had authority to convene a military commission to try offenses against the law of war.
Holding
Yes. Congress had authorized military commissions to try offenses that are triable under the law of war, and the President could convene such a commission as Commander in Chief.
Reasoning
The Constitution gives Congress substantial war powers, including the powers to declare war, regulate the armed forces, define and punish offenses against the law of nations, and enact laws necessary and proper to carry those powers into effect. It makes the President Commander in Chief and charges him with executing the laws governing wartime operations.
Congress's Articles of War recognized military commissions as tribunals with concurrent jurisdiction over offenses that, by statute or by the law of war, may be tried before them. Article 15 incorporated the law of war rather than attempting to codify every offense in detailed statutory language.
The Court held that Congress could adopt the law of war by reference. Just as Congress may punish piracy as defined by the law of nations, it could authorize military commissions to try offenses defined by the established law of war, subject to constitutional limitations.
Issue #3
Whether the saboteurs' alleged entry into the United States in civilian clothes to destroy war facilities stated an offense against the law of war triable by military commission.
Holding
Yes. The allegations charged unlawful belligerency, a recognized law-of-war offense within the commission's jurisdiction.
Reasoning
The law of war distinguishes lawful from unlawful combatants. Lawful combatants may be captured and detained as prisoners of war, while unlawful combatants may also be tried and punished by military tribunals for conduct that makes their belligerency unlawful.
An enemy combatant who secretly enters a belligerent's territory without uniform or another identifying emblem, intending to undertake hostile acts, is an unlawful belligerent. Historical military practice, the Hague Convention framework, military regulations, and recognized international-law authorities supported that rule.
The petitioners were alleged to have landed from enemy submarines, discarded their uniforms, traveled in civilian dress, and entered American territory with explosives and instructions to destroy war industries and utilities. Modern warfare includes attacks on war production and transportation as well as attacks on armed forces, so the alleged planned sabotage was a hostile act within the law of war.
The offense was complete upon their covert entry, or continued presence after entry, in civilian dress with hostile purpose. The Government did not need to prove that they had already committed sabotage, used conventional weapons, or entered an active battlefield.
Issue #4
Whether Haupt's claimed United States citizenship required his prosecution in a civilian court rather than before a military commission.
Holding
No. Even assuming Haupt was a United States citizen, citizenship did not protect an enemy belligerent from trial for unlawful belligerency.
Reasoning
The Court found it unnecessary to resolve whether Haupt had retained American citizenship. The relevant allegation was that he had associated himself with the German military enterprise and entered the United States under its direction to commit hostile acts while concealing his belligerent status.
A citizen who joins the military arm of an enemy nation and covertly enters the United States to commit hostile acts may be treated as an enemy belligerent. His citizenship does not erase the law-of-war consequences of entering in civilian dress for sabotage.
The Court also distinguished unlawful belligerency from treason. Treason has separate constitutional elements, while the law-of-war offense turned on the enemy agent's covert and ununiformed hostile entry.
Issue #5
Whether Article III and the Fifth and Sixth Amendments required indictment and jury trial in a civilian court for these alleged law-of-war offenses.
Holding
No. The constitutional jury-trial and grand-jury guarantees did not extend to offenses against the law of war that were traditionally triable by military commission.
Reasoning
Article III and the Fifth and Sixth Amendments preserved the jury-trial right as it existed at common law; they did not convert every proceeding imposing punishment into an ordinary civilian criminal prosecution. Military tribunals were not Article III courts, and jury procedures were historically unknown to their wartime operation.
From the nation's founding, military tribunals had tried enemy spies and other unlawful belligerents without juries. The Court treated that longstanding practice, including early congressional authorization for military trial of spies, as a powerful contemporary interpretation of the Constitution.
The Fifth Amendment's express exception for cases arising in the land or naval forces did not imply that every other military proceeding required a jury. That exception enabled courts-martial to try service members for offenses that otherwise might fall within civilian jury guarantees; it did not disturb the distinct historical practice of military trials for law-of-war offenses by enemy belligerents.
Because the charged unlawful-belligerency offense was one traditionally triable by military commission, neither the petitioners' alienage nor Haupt's possible citizenship created a constitutional right to indictment or jury trial.
Issue #6
Whether Ex parte Milligan prohibited the military trial because civilian courts were open and functioning.
Holding
No. Milligan did not control because the petitioners were charged as enemy belligerents violating the law of war, not as non-belligerent civilians.
Reasoning
Milligan held that a civilian resident of Indiana, who was not part of or associated with the enemy's armed forces, could not be tried by military commission while civilian courts were open. The Court read Milligan's language in light of that critical fact: Milligan was a non-belligerent.
The Quirin petitioners, by contrast, were charged with acting under the direction of a belligerent enemy state and infiltrating American territory in civilian clothing to conduct hostile sabotage. The Court therefore treated them as enemy belligerents subject to the law of war, rather than as ordinary civilians whose alleged crimes had to be tried in civil court.
Issue #7
Whether the President's prescribed commission procedures conflicted with the Articles of War and made the petitioners' detention unlawful.
Holding
No. The Court unanimously concluded that the cited Articles of War provided no basis for habeas relief, although the Justices did not agree on a single rationale.
Reasoning
The petitioners argued that the President's order and the commission's secret procedures conflicted with several Articles of War governing military commissions and review. They maintained that a conviction under unlawful procedures would make their present detention for trial unlawful.
The Court stated that all participating Justices agreed the cited Articles could not justify issuance of habeas corpus, but they divided over why. Some concluded that Congress had not intended those provisions to govern a presidential commission trying admitted enemy invaders; others concluded that the provisions, properly interpreted, did not prohibit the procedures used.
Because Charge I validly alleged unlawful belligerency and the commission was lawfully constituted to try that charge, the Court held that the petitioners were in lawful custody and had shown no ground for discharge. The Court therefore did not decide the adequacy or constitutionality of the remaining charges under the Articles of War.