Hmmm, an odd comment from one so knowledgeable. You should know what the definition of “Treason” is.
The word can be used as a synonym for the highest form, ultimate betrayal. That is the sense in which I understood the original poster and the sense I used in my reply. I may be helpful to recall also that when the Founders were hotly debating the future of the country, accusations of nothing less than treason were quite common.
Subsequently, the Constitution specified which acts would be viewed as treasonous for the purpose of administering the law of the U.S. That is probably what you meant in your post. We are not in contradiction: the U.S. Constitution did not monopolize for itself the general use of the word "treason."