Unsound Unsound:
I would be completely fine with charging him with treason.
So I asked myself, 'Do we even do that? And when was the last time we did, if we do?"
Wanna take a trivia break? It's kind of a fascinating story. Ever heard of "the Kamploops Kid?"
His name was Kanao Inouye, and he was hung for treason in 1947.
https://en.wikipedia.org/wiki/Kanao_Inouye$1:
After the Japanese capitulation in August 1945, Inouye was arrested in Kowloon and tried for war crimes by a military tribunal. He was convicted and was sentenced to death. However, the verdict was overturned on appeal, since as a Canadian citizen, he could not be prosecuted for war crimes committed by an enemy army.
In April 1947, Inouye was tried on the criminal charge of treason, was again found guilty and sentenced to death. Subsequently, on August 27, 1947, he was executed by hanging on the gallows at Hong Kong's Stanley Prison. His last word was "Banzai!"
The last guy I could find before that was Louis Riel.