Two interesting bits of information:
"In the Constitution, the framers changed English law. The corruption of blood and forfeiture end after the offender dies, not down the hereditary line. The offender may be put to death or jailed. There is no reference to a king because the United States is a representative democracy. However, the framers retain the need for the testimony of two witnesses to the same overt act. The Constitution asserts,
Treason against the United States, shall consist only in levying war against them, or in adhering to their enemies, giving them aid and comfort. No person shall be convicted of treason unless on the testimony of two witnesses to the same overt act, or on the confession in open court. The Congress shall have the power to declare the punishment of treason, but no attainder of treason shall work corruption of blood, or forfeiture except during the life of the person attained [9].
Even in the 21st century, treason remains the highest crime, punishable by the highest penalty. Even in the state of Michigan, where capital punishment is outlawed, a person who commits treason may be put to death. "
http://www.umich.edu/~ece/student_projects...d/treason2.htmlAnd here is a portion of the Field Manual for the Union Army in the Civil War. This is the kind of leeway officers should have in the field; the word "DEATH" appears prominently, and see articles 90 and 91; like I said, Lindh got off easy:
"Safe-conduct - Spies - War-traitors - Captured messengers - Abuse of the flag of truce...
Art. 86.
All intercourse between the territories occupied by belligerent armies, whether by traffic, by letter, by travel, or in any other way, ceases. This is the general rule, to be observed without special proclamation.
Art. 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.
Art. 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.
Art. 90.
A traitor under the law of war, or a war-traitor, is a person in a place or district under Martial Law who, unauthorized by the military commander, gives information of any kind to the enemy, or holds intercourse with him.
Art.91.
The war-traitor is always severely punished. If his offense consists in betraying to the enemy anything concerning the condition, safety, operations, or plans of the troops holding or occupying the place or district, his punishment is death.
Art. 92.
If the citizen or subject of a country or place invaded or conquered gives information to his own government, from which he is separated by the hostile army, or to the army of his government, he is a war-traitor, and death is the penalty of his offense.
Art. 93.
All armies in the field stand in need of guides, and impress them if they cannot obtain them otherwise.
Art. 94.
No person having been forced by the enemy to serve as guide is punishable for having done so.
Art. 95.
If a citizen of a hostile and invaded district voluntarily serves as a guide to the enemy, or offers to do so, he is deemed a war-traitor, and shall suffer death.
Art. 96.
A citizen serving voluntarily as a guide against his own country commits treason, and will be dealt with according to the law of his country.
Art. 97.
Guides, when it is clearly proved that they have misled intentionally, may be put to death.
Art. 98.
An unauthorized or secret communication with the enemy is considered treasonable by the law of war.
Foreign residents in an invaded or occupied territory, or foreign visitors in the same, can claim no immunity from this law. They may communicate with foreign parts, or with the inhabitants of the hostile country, so far as the military authority permits, but no further. Instant expulsion from the occupied territory would be the very least punishment for the infraction of this rule.
Art. 99.
A messenger carrying written dispatches or verbal messages from one portion of the army, or from a besieged place, to another portion of the same army, or its government, if armed, and in the uniform of his army, and if captured, while doing so, in the territory occupied by the enemy, is treated by the captor as a prisoner of war. If not in uniform, nor a soldier, the circumstances connected with his capture must determine the disposition that shall be made of him.
Art. 100.
A messenger or agent who attempts to steal through the territory occupied by the enemy, to further, in any manner, the interests of the enemy, if captured, is not entitled to the privileges of the prisoner of war, and may be dealt with according to the circumstances of the case.
Art. 101.
While deception in war is admitted as a just and necessary means of hostility, and is consistent with honorable warfare, the common law of war allows even capital punishment for clandestine or treacherous attempts to injure an enemy, because they are so dangerous, and it is difficult to guard against them.
Art. 102.
The law of war, like the criminal law regarding other offenses, makes no difference on account of the difference of sexes, concerning the spy, the war-traitor, or the war-rebel.
Art. 103.
Spies, war-traitors, and war-rebels are not exchanged according to the common law of war. The exchange of such persons would require a special cartel, authorized by the government, or, at a great distance from it, by the chief commander of the army in the field.
Art. 104.
A successful spy or war-traitor, safely returned to his own army, and afterwards captured as an enemy, is not subject to punishment for his acts as a spy or war-traitor, but he may be held in closer custody as a person individually dangerous.
http://www.yale.edu/lawweb/avalon/lieber.htm