2. The constitution of the United States, art. 3, s. 3, defines treason against the United States to consist only in levying war (q.v.) against them, or in adhering to their enemies, giving them aid or comfort. This offence is punished with death.
http://legal-dictionary.thefreedictionary.com/Treason
treason. n. the crime of betraying one's country, defined in Article III, section 3 of the U. S. Constitution: Treason against the United States shall consist only in levying war against them, or in adhering to their enemies, giving them aid and comfort..
http://legal-dictionary.thefreedictionary.com/Treason
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 Confession in open Court.
https://en.wikipedia.org/wiki/Treason
In his instructions to the Grand Jury of the United States Court, on the subject of high treason, Judge SMALLEY is at once a sound expositor of Constitutional law and of public opinion. There is no reason whatever to entertain doubt upon either point.
http://www.nytimes.com/1861/01/16/news/what-constitutes-treason.html
Treason against the United States, shall consist only in levying War against them, or in adhering to their Enemies, giving them Aid and Comfort. The Constitution of The United States by History Documents View in context.
http://legal-dictionary.thefreedictionary.com/Treason
The acts defined by articles 411-2 to 411-11 constitute treason where they are committed by a French national or a soldier in the service of France, and constitute espionage where they are committed by any other person.
https://en.wikipedia.org/wiki/Treason
To these active agents in the service of treason the penalties denounced by the charge of Judge SMALLEY immediately attach, and they should be at once inflicted. Another and passive form of the same crime might perhaps be better described as disaffection.
http://www.nytimes.com/1861/01/16/news/what-constitutes-treason.html
Under Article III, Section 3, of the Constitution, any person who levies war against the United States or adheres to its enemies by giving them Aid and Comfort has committed treason within the meaning of the Constitution.
http://legal-dictionary.thefreedictionary.com/Treason
In law, treason is the crime that covers some of the more extreme acts against one's sovereign or nation. Historically, treason also covered the murder of specific social superiors, such as the murder of a husband by his wife or that of a master by his servant.
https://en.wikipedia.org/wiki/Treason
High treason was formerly distinguished from petty treason, a treason committed against a subject of the sovereign, the scope of which was limited by statute to the murder of a legal superior. Petty treason comprised the murder of a master by his servant, of a husband by his wife, or of a bishop. Petty treason ceased to be a distinct offence from murder in 1828, and consequently high treason is today often referred to simply as treason. Considered to be the most serious of offences, high treason was often met with extraordinary punishment, because it threatened the security of the state. Hanging, drawing and quartering was often employed. The last treason trial was that of William Joyce, who was executed in 1946.
https://en.wikipedia.org/wiki/High_treason_in_the_United_Kingdom
what constitutes treason
Treason against the United States, shall consist only in levying war against them, or in adhering to their enemies, giving them aid and comfort.   Treason against the United States, shall consist only in levying War against them, or in adhering to their Enemies, giving them Aid and Comfort.