Cambodia and the Khmer Rouge: Pol Pot and the Killing Fields

What was Cambodia's situation before the Khmer Rouge?

Cambodia had been destabilised by the Vietnam War. American bombing campaigns in the late 1960s and early 1970s — intended to destroy Vietnamese communist supply routes running through Cambodia — killed large numbers of civilians and created widespread suffering. A US-backed coup in 1970 replaced the neutral Prince Sihanouk with General Lon Nol, fuelling rural resentment and driving many Cambodians towards the Khmer Rouge rebel movement.

By 1973 the Khmer Rouge controlled most of the Cambodian countryside. After years of civil war, they captured the capital Phnom Penh on 17 April 1975, establishing the regime they called "Democratic Kampuchea."

Who was Pol Pot and what was his ideology?

Pol Pot (born Saloth Sar in 1925) was the leader of the Khmer Rouge and the dominant force behind its ideology. He had studied in Paris in the early 1950s and was influenced by Stalinist and Maoist communism, as well as by French intellectuals who romanticised peasant life.

His ideology, which he called "Year Zero," held that:

• Cambodian history must be restarted from scratch — hence Year Zero
• Cities were corrupt and must be evacuated
• Educated people ("intellectuals") were enemies of the revolution
• The ideal Cambodia would be a rural, self-sufficient agricultural society without money, religion, or private property
• Cambodia must be completely isolated from foreign influence

Within days of taking power, the Khmer Rouge forcibly evacuated the entire population of Phnom Penh — approximately 2.5 million people — at gunpoint, driving them into the countryside.

What were the killing fields?

The "killing fields" is the name given to the hundreds of sites across Cambodia where the Khmer Rouge executed prisoners and buried the bodies in mass graves. The term became internationally known after the 1984 film of the same name.

Executions were carried out with primitive methods — guns were considered a wasteful use of bullets. Victims were often killed with machetes, axes, bamboo staves, or by having their throats cut. Bodies were dumped in mass graves.

The most significant single site is Choeung Ek, 15 kilometres south of Phnom Penh, where over 17,000 people were executed. It is now a memorial and museum.

Who was targeted and how many people died?

The scale of the killing was staggering relative to Cambodia's population:

Overall death toll estimates:

• Low estimate: approximately 1.5 million deaths (around 20% of the 1975 population of ~7.5 million)
• High estimate: approximately 2.2 million deaths (around 30% of the population)
• The most widely cited scholarly estimate is approximately 1.7 million deaths

What was Tuol Sleng (S-21)?

Tuol Sleng was a former Phnom Penh high school converted into a secret prison and interrogation centre, known as Security Prison 21 (S-21). Between 1975 and 1979, an estimated 17,000 people were imprisoned there. Prisoners were systematically tortured into signing confessions of imaginary crimes before being taken to the killing fields at Choeung Ek.

Only seven adults are known to have survived S-21 as prisoners. It is now a genocide museum and UNESCO site.

How did the Khmer Rouge regime end?

Relations between Cambodia and neighbouring Vietnam deteriorated throughout the late 1970s, partly because the Khmer Rouge harboured deep hostility towards Vietnam (despite both being communist) rooted in historical territorial disputes. Khmer Rouge forces launched raids into Vietnamese territory, killing thousands of Vietnamese civilians.

On 25 December 1978, Vietnam launched a full-scale invasion of Cambodia. Within two weeks, on 7 January 1979, Vietnamese forces captured Phnom Penh. Pol Pot and the Khmer Rouge fled to jungle areas on the Thai border, where they continued as a guerrilla force for nearly two decades with tacit support from China and, controversially, continued recognition at the United Nations.

Pol Pot died in 1998 under house arrest by his own movement, never having faced trial.

What is the ECCC and what has it achieved?

The Extraordinary Chambers in the Courts of Cambodia (ECCC), sometimes called the Khmer Rouge Tribunal, was established in 2003 as a joint UN–Cambodian court. Its proceedings did not begin until 2007.

Key convictions include:

• Kaing Guek Eav ("Duch"), commandant of Tuol Sleng — convicted 2010, sentenced to life imprisonment, died in custody 2020
• Nuon Chea ("Brother Number Two"), chief ideologist of the regime — convicted 2014, died during appeal in 2019
• Khieu Samphan, head of state under the regime — convicted 2014, final conviction upheld 2022

The tribunal was criticised for being slow and expensive — costing over $330 million — with many perpetrators dying before trial. However, it has generated an important historical record and provided some justice for survivors.

Frequently asked questions

Why did the international community not intervene to stop the Khmer Rouge?

Several factors prevented intervention. The Cold War context meant that Vietnam's invasion — which actually ended the genocide — was viewed with suspicion by the West because Vietnam was allied with the Soviet Union. China, which backed the Khmer Rouge, would have vetoed any UN Security Council action. There was also limited information coming out of Cambodia, which was entirely closed to foreigners. International awareness of the scale of the killing grew only slowly throughout 1975–79.

Did the United States support the Khmer Rouge?

The United States did not directly support the Khmer Rouge while it was in power. However, American bombing campaigns in the early 1970s contributed to the destabilisation that allowed the Khmer Rouge to rise. After 1979, the USA and its allies tacitly supported the Khmer Rouge in exile as a counterbalance to Vietnamese (and thus Soviet) influence in South-East Asia, allowing the Khmer Rouge to retain Cambodia's UN seat until 1991. This is considered one of the most morally controversial aspects of Cold War US foreign policy.

What does "Year Zero" mean?

Year Zero was the Khmer Rouge's name for their ideological project of restarting Cambodian civilisation from scratch, wiping out all previous history, culture, and social structures. By abolishing money, closing schools and hospitals, banning religion, evacuating cities, and forcing everyone into agricultural labour, they aimed to create a pure agrarian communist society with no link to the past. The concept was deeply influenced by Mao's Cultural Revolution in China, though even more extreme in its application.

How is the genocide remembered in Cambodia today?

Every year on 20 May, Cambodia marks the Day of Anger (now renamed the National Day of Remembrance), during which Cambodians visit Buddhist pagodas and commemorate the victims. Many survivors carry profound trauma, and a significant proportion of the population suffers from PTSD-related conditions. Cambodia's population is demographically young because the genocide killed disproportionately many adults. The process of national reconciliation is ongoing, complicated by the long post-1979 civil war and the slow pace of legal accountability.

Let Professor Mercator guide you through Cambodia and the Khmer Rouge — visit aitutors.me.