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Exceptions to this rule, whether by safe-conduct, or permission to trade on a small or large scale, or by exchanging mails, or by travel from one territory into the other, can take place only according to agreement approved by the government, or by the highest military authority.
Contraventions of this rule are highly punishable.
87.
Ambassadors, and all other diplomatic agents of neutral powers, accredited to the enemy, may receive safe-conducts through the territories occupied by the belligerents, unless there are military reasons to the contrary, and unless they may reach the place of their destination conveniently by another route. It implies no international affront if the safe-conduct is declined. Such passes are usually given by the supreme authority of the State, and not by subordinate officers.
88.
A spy is a person who secretly, in disguise or under false pretense, seeks information with the intention of communicating it to the enemy.
The spy is punishable with death by hanging by the neck, whether or not he succeed in obtaining the information or in conveying it to the enemy.
89.
If a citizen of the United States obtains information in a legitimate manner, and betrays it to the enemy, be he a military or civil officer, or a private citizen, he shall suffer death.
