The answer is 1977. This was a time when Pol Pot was in control of Cambodia. In 1976, Pol Pot had begun to crack down on those who were not loyal to him. In 1977, Pol Pot ordered the execution of several senior leaders of the Khmer Rouge, including his own brother. This led to a rebellion against Pol Pot by those who had been loyal to him.
Mastering the Legacy: Exploring the Dominance of Hun Sen - An Engaging Quiz on Cambodia's Longest-serving Prime Minister