He was a 'traitor' who betrayed his country by selling military secrets to the enemy.
He 'turned traitor'. [=he became a traitor; he betrayed his country/friends]
She has been called a 'traitor' to the liberal party's cause.
(..) in chains? He's not my prisoner. No? What is he? We're allies. You fucking traitor. You fight for the crows now? I don't fight for the crows. We're not here to fight. (..)2015 TvShow: Game of Thrones Title: Hardhome Season: 5 Episode 8