Carlton F.W. Larson, in clear language, tells what treason is and what it isn’t. Its narrow framing came as a surprise to me.
One is not likely to be prosecuted for treason right now because we are not at war, and the treasonous act has to be in support of an enemy. Also, it must involve an army and it must have two witnesses.
The book covers the fate of famous, presumably traitorous, figures that run from Benedict Arnold to Tokyo Rose and the Rosenbergs. He shows the difficulty of prosecuting a case based on the constitutional definition of committing treason.
Larson covers the legal issues faced by those who have criticized US policy from John Brown’s raid to the photo of Jane Fonda in Hanoi and to Edward Snowden’s disclosures. There are details on who is covered by law, (i.e. citizens, non-citizens, native Americans) and state laws concerning treason against the specific state.
There is a short test in the end which the reader should pass with the clue (this was written by a lawyer) that two answers are “probably not”.
If you want a handy guide (and reference book) on treason, this is the book for you.