Legally speaking: Breaking and entering a federal government building, stealing information, conspiring with a foreign national to sell the information to a foreign state intelligence service.
I think life sentences have been handed out for smaller forms of treason...
Yeah under US law I think you'd have to giving the info to a nation the US was at war with for it to be treason. That came up a bit in the whole Trump Russia collusion debate.
I think life sentences have been handed out for smaller forms of treason...