Neither.
Just a man, who while doing his job, learned of illegal actions, and decided to tell others, with evidence.
I don't have a word for that which is not rife with connotation, so I'll not try. I just wonder, what would I have done, exposed to such information?
He is a man without a country, that was his sacrifice, and he knew it'd happen. He saw what was done to Manning. He'll never come home a free man.