Why not? He was a mass murderer and he did support germans and probably was draining info to them. It was an open hearing with local and foreign journalists, what are your doubts?
I'm not doing any justification, value judgement or taking sides, just stating facts. There were two factions fighting for power, one of them lost, people loyal to it were removed. It didn't happen neither for first time, nor for last time in human history.
