This is a list of people convicted of treasons.
Some countries have a high constitutional hurdle to conviction for treason, while many countries have less stringent definitions.
The Republic of Hawaii government had one trial for treason after the failed 1895 Counter-Revolution in Hawaii. Those charged were found guilty, but pardoned after serving time in prison.
For the betrayal of General Stefan Rowecki to the Gestapo:
For betrayal of the Polish People's Republic: