Answer:
4: The Khmer Rouge refused to follow a peace agreement established with the United Nations in 1991
Step-by-step explanation:
The Khmer Rouge is definitely the most terrible thing that has happened to the people of Cambodia, and the worst period was when Pohl Pot was the leader. Around two million people lost their lives, many more were tortured, everything was taken away from the people, and violence was what ruled the country. The Khmer Rouge managed to commit pretty much all crimes against humanity unfortunately. One thing that can not be considered as a violation of the human rights is that it didn't followed the agreement with the United Nations in general, as that is more of a diplomatic issue between two sides.