Prosecute MEK leaders for killing my brother

The Mujahedin-e Khalq arrested my brother; Kheirollah Zakeri during the Iran-Iraq war. They imprisoned him in their camp for along time. Putting him under physical and mental pressure, the MEK forced my young brother into participating in their failed operation against Iran called Eternal Light.
During that operation he was killed suspiciously.

Based on the Geneva Convention relative to the “Treatment of Prisoners of War” no detaining power is allowed to use POWs for political or military purposes.
Though the Mujahedin-e Khalq cult leaders committed this crime against several prisoners and violated the rules of the convention, why haven’t been prosecuted so far?!

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