The betrayal of one's own country by waging war against it or by consciously or purposely acting to aid its enemies.
The Treason Clause traces its roots back to an English statute enacted during the reign of Edward III (1327–1377). This statute prohibited levying war against the king, adhering to his enemies, or contemplating his death. Although this law defined treason to include disloyal and subversive thoughts, it effectively circumscribed the crime as it existed under the Common Law. During the thirteenth century, the crime of treason encompassed virtually every act contrary to the king's will and became a political tool of the Crown. Building on the tradition begun by Edward III, the Founding Fathers carefully delineated the crime of treason in Article III of the U.S. Constitution, narrowly defining its elements and setting forth stringent evidentiary requirements.
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. The term aid and comfort refers to any act that manifests a betrayal of allegiance to the United States, such as furnishing enemies with arms, troops, transportation, shelter, or classified information. If a subversive act has any tendency to weaken the power of the United States to attack or resist its enemies, aid and comfort has been given.