The Constitution specifically identifies what constitutes treason against the United States and, importantly, limits the offense of treason to only two types of conduct: (1) “levying war” against the United States; or (2) “adhering to [the] enemies [of the United States], giving them aid and comfort.” Although there have not been many treason prosecutions in American history—indeed, only one person has been indicted for treason since 1954—the Supreme Court has had occasion to further define what each type of treason entails.