A US-based organization for survivors of the Khmer Rouge condemned the UN-backed war crimes tribunal on Thursday for preventing overseas Cambodians from taking part in the court’s controversial third case.

Tribunal observers fear the court is trying to dismiss those cases in the face of stringent government opposition.

The U.S.-based survivors group ASRIC says the war crimes tribunal in Phnom Penh will fail to deliver justice if it ditches its third and fourth cases that are opposed by the Cambodian government.