There was no US and the Constitution had yet to be written at the time of the Revolutionary war so Arnold is eliminated in a legal sense. Loyalty to the states was an important issue in the Civil War so it is a waste of time to try to convict Lee and his generals when the federal government made no effort to do so after the war. It's probably a good idea to limit the search for the notorious traitors in the 20th century and you have to break it down to actual effect of the treason rather than the pop-culture's emotional version. In my mind Oswald is at the top of the list. He wasn't just an assassin, he was literally a traitor. The Rosenburg conspiracy has yet to be defined as to whether or not the Russians could have developed the A-bomb on their own. Jane Fonda should be on the list as well as her partner John Kerry in their plot to unite the anti-war faction with the civil rights unrest in the revolutionary "winter soldiers project". Bill Ayers certainly fits the bill with an almost decade long terrorism rampage and revolutionary agenda. The FBI and CIA spies were traitors but their brand of treason was localized and did nothing more than undermine a corrupt and failed intelligence system.
