15.4.2025 by Michael G. Vann - Fifty years ago today, the Khmer Rouge took power in the Cambodian capital Phnom Penh. Instead of rebuilding the country after a destructive US bombing campaign, Pol Pot’s movement plunged it into one of the last century’s most horrifying catastrophes.
April 1975 was a pivotal moment in global revolutionary history. In the space of two weeks, communist forces changed the map of Southeast Asia and sent shockwaves around the world.
After the dramatic fall of the Cambodian capital Phnom Penh to the Khmer Rouge and the capture of Saigon by North Vietnamese forces, the Second Indochina War (1955–75) ended with Communist parties claiming victory. By the end of the year, Laotian communists had peacefully occupied Vientiane and avowedly Marxist regimes now controlled all of France’s former Indochinese colonies.
The events of this month constituted the single greatest setback to Washington’s Cold War effort. The inability of the US empire to protect its anti-Communist client states was profoundly embarrassing. Domestically, this shame would feed the conservative reaction of the Ronald Reagan era. Internationally, the United States devised a new set of tactics, including what it called “low-intensity conflicts” and a robust program of covert actions.
For the international left, April 1975 was a moment of relief and cautious optimism, with widespread hopes that these new revolutionary regimes would establish peace and socially just societies. This optimism soon collapsed in the face of a horrific spasm of violence and suffering.
The international right would use the catastrophe of Khmer Rouge rule as an anti-Communist trump card — even though, in a breathtaking twist of Cold War realpolitik, the Reagan administration ended up supporting Pol Pot’s movement against Vietnam. April 17 should be remembered as a disastrous moment in the world history of revolutions.
Origins of the Khmer Rouge
When the Khmer Rouge, secretly led by Pol Pot, seized Phnom Penh, it effectively ended the first Cambodian Civil War (1967–75). Ironically, it was French colonial rule that had introduced Marxism to Cambodia. During the 1950s, a handful of elite Cambodian students received scholarships to study in France. These young Khmer students encountered postwar Paris at the height of the popularity of the French Communist Party (PCF).
Khieu Samphan earned his doctorate in economics at the Sorbonne with a dissertation that theorized an independent and self-reliant Cambodia. Also at the Sorbonne, Hou Yuon’s dissertation, The Cambodian Peasants and Their Prospects for Modernization, argued that urbanization and industrialization were not necessary for Cambodian development. Two students, Ieng Sary and Khieu Thirith, fell in love and married in Paris. The bride, a Shakespeare scholar, was the first Khmer to earn a degree in English literature.
Saloth Sar, the man who would later become known to the world as Pol Pot, was in Paris from 1949 to 1953 to study radio-frequency engineering. A poor student who was often homesick, he joined other Khmer students in an underground Marxist reading group and then entered the PCF. A loyal Stalinist, Maurice Thorez, ran the party with a firm hand during a period when it received more than one-quarter of the national vote, more than any other French political force in the immediate postwar years.
If Saloth Sar had difficulty understanding the details of Marxist theory, he appreciated Thorez’s strict discipline. He was also inspired by Mao Zedong’s surprising success in the Chinese Civil War and the possibilities of adapting Marxism to the material conditions of rural Asia. Upon his return to Phnom Penh, he joined the Communist Party of Kampuchea.
The Cambodian ruler Norodom Sihanouk began referring to his country’s communists as the Khmer Rouge (“Red Khmer”), and the name stuck. By the early 1960s, Sar had adopted the nom de guerre “Pol Pot” and he became the party’s general secretary. He and his fellow students from Paris worked to push an older generation of leaders out of the party and soon dominated the Khmer Rouge leadership.
The small party had difficulties making inroads into Khmer society and faced violent repression from the charismatic Prince Sihanouk’s government. In 1963, Pol Pot led a small group of loyal comrades into the mountainous rainforests of northeastern Cambodia, far from the lively capital city. Following Mao’s example, they set about recruiting the rural peasantry into the revolutionary cause. Their rhetoric became increasingly anti-urban, arguing that the wealthier city dwellers were not only class enemies but also inauthentically Khmer.
When a local revolt against the government broke out in 1967, an opportunistic faction of the Khmer Rouge tried to turn it into a wider revolutionary movement. Sihanouk’s prime minister and former minister of defense, General Lon Nol, savagely cracked down on the revolt with summary executions, the burning of villages, and an alleged bounty for severed heads (there were reports of truckloads of grisly war trophies bound for Phnom Penh).
In the ensuing cycle of chaotic violence, some villagers fled into the jungles and joined the rebels. The government’s heavy-handed tactics served as a recruiting tool for the Khmer Rouge. In 1970, Lon Nol launched a coup against Prince Sihanouk, who Cambodian right-wingers viewed as being too tolerant of the Communists. Lon Nol’s regime immediately increased the violence against the Khmer Rouge but also massacred ethnic Vietnamese in genocidal pogroms.
To make matters worse, the US war in Vietnam began to spill over the border. In 1969, the Nixon administration secretly and illegally bombed significant portions of Cambodia and briefly launched a ground invasion of the country in 1970 in a quixotic campaign to break the Ho Chi Minh Trail.
The Road to Power
As the civil war between Lon Nol and the Khmer Rouge intensified, Washington expanded the bombing to support the anti-Communist strongman. The bombing successfully prevented the encirclement of the capital but inflicted massive collateral damage with perhaps 300,000 deaths. With their villages destroyed, hundreds of thousands of traumatized peasants fled to the safety of the capital city. Soon Phnom Penh was overwhelmed with refugees as close to a third of the nation’s population was displaced in this sideshow of the Second Indochina War.
The American bombing served as excellent propaganda for the Khmer Rouge. Within a few years, the ragtag group of outcasts led by French-educated intellectuals had become a popular revolutionary movement that controlled 85 percent of Cambodia by early 1973.
With strict attention to discipline, ideological purity, and secrecy, the party, which referred to itself simply as Angkar (“the organization”), enacted its revolution in the areas it controlled. The Khmer Rouge reorganized villages into collective farms, abolished private property, and forced the population to wear dyed black clothes accessorized with a krama, a traditional scarf.
Observers frequently characterized the Khmer Rouge revolution as an extreme interpretation of Marxist-Leninist ideology that sought to create an agrarian utopia, free from the influences of capitalism and Western imperialism. Anti-communist scholarship drew a straight line from Vladimir Lenin to Joseph Stalin to Mao to Pol Pot, presenting these regimes as the logical evolution of revolutionary violence.
However, overly simplistic Cold War analyses failed to explain why the party was able to win the support of the peasantry. While the alliance of convenience between the party and the deposed Prince Sihanouk undeniably helped attract a pious rural population that revered the Buddhist monarch, the appeal of Khmer Rouge ideology and praxis should not be dismissed. Following a Maoist strategy, the Khmer Rouge lived among marginalized rural communities, shared in their poverty, and acknowledged their increasingly dire conditions.
The 1960s saw the development of increasingly burdensome taxes, government corruption, and radical disparities in wealth. The Khmer Rouge was the only institution that spoke to and for the rural poor, thus winning their support. When the violence started in 1967, the party again showed that it was on the side of the peasantry, not the urban elite. In contrast to the indiscriminate counterinsurgency tactics of the government based in Phnom Penh, the party sought to fight a Maoist people’s war.
The party persuaded many of its peasant supporters that the city dwellers were their enemies. Unlike the rural “base people,” the corrupt and decadent “new people” were insufficiently Khmer. As Yale historian Ben Kiernan has argued, the Khmer Rouge revolution was a nationalist or even racial one that stigmatized city dwellers as aliens who had been tainted by the influence of the Vietnamese, the French, and the Americans. The horrors of the US bombing campaigns offered real-world evidence to back up theoretical critiques of Western imperialism.
After the Fall
The April 17 fall of Phnom Penh came after months of intense fighting and strategic maneuvers. The Khmer Rouge systematically cut off supply routes, isolating the city and making it increasingly dependent on aerial resupply. As the situation grew dire, the United States evacuated its nationals and a handful of allied Cambodians, leaving the city to its fate.
The Khmer Republic government attempted to relocate and continue resistance, but those efforts were futile. By the end of April 17, the Khmer Rouge had overrun the last defenses and occupied the capital.
As the insurgents entered Phnom Penh, many of its residents felt a sense of relief. They hoped that the awful civil war was finally over and were curious to see what the mysterious Khmer Rouge looked like. Yet chaos soon spread. Fearful of reprisals, Lon Nol’s troops shed their uniforms and tried to blend in with the civilians.
The city’s streets quickly filled with guerrilla fighters. Young peasant boys dressed in black with red scarves wrapped around their necks, heads full of Khmer Rouge propaganda, and crude revolutionary slogans on their lips waved their AK-47s, pistols, and grenade launchers, both to celebrate their victory and to intimidate the conquered city.
The occupiers announced that as the Americans were about to bomb the city, which had swollen to perhaps as many as two million people, everyone had to immediately evacuate Phnom Penh. This was a ruse. In the space of a couple of days, the once-bustling capital was depopulated and then lightly repopulated by Khmer Rouge officials. For the next three and a half years, the city’s population only numbered in the tens of thousands.
The evacuation of Phnom Penh enabled the Khmer Rouge to identify and target their perceived enemies — the “new people.” Government officials, military officers, regular soldiers, and anyone suspected of being part of the educated or wealthy elite were seized. Executions began immediately.
Victims were taken behind bushes or into bamboo thickets and murdered, marking the beginning of what would become known as the infamous “killing fields.” Chaos spread as refugees fled the capital, uncertain of where to go. Intimidated by the young, black-clad Khmer Rouge soldiers shouting orders, most followed instructions out of fear.
Killing Fields
The nature of life under Khmer Rouge rule varied, though conditions were harsh everywhere. Some areas were quieter and less violent, but survival often depended on luck as much as strategy. While there was no organized resistance movement, there were individual acts of defiance as well as small groups of people who hid in the remote hills, quietly raiding communal villages at night.
Some former residents of Phnom Penh wandered from village to village in search of food and shelter. Others were forcibly marched to rural labor camps. Across the countryside, the Khmer Rouge established thousands of communal villages as part of their radical agrarian communist project.
Private property was abolished. Citizens were forced to wear dark clothing and eat in communal halls. Confused and disoriented, Cambodians were subjected to mandatory political indoctrination, chanting slogans in praise of Angkar, the shadowy leadership of the regime. Pol Pot did not reveal himself to be the leader — “Brother Number One” — until 1977.
Those labeled “new people,” or “April 17th people,” suffered the most. Many were worked to death. While some families remained together, others were separated and placed in communal barracks. Children were especially targeted as the Khmer Rouge attempted to sever family bonds and recruit child soldiers. Young women found themselves forced into marriages with complete strangers.
Angkar cadres ordered people into agricultural labor or large-scale construction projects. With a lack of engineering or planning expertise, mismanagement led to economic collapse, and hundreds of thousands died from malnutrition and disease. Medical care was primitive and often had the effect of worsening the condition of patients. The Khmer Rouge deserve their reputation for revolutionary violence, but the vast majority of the estimated 1,700,000 deaths were victims of their shocking incompetence as rulers.
The Khmer Rouge fused a superficial command of Marxism with an intense, xenophobic nationalism. Despite earlier cooperation with Vietnamese communists, they turned violently against both ethnic Vietnamese in Cambodia and the newly unified Vietnamese state. Massacres of ethnic Vietnamese had begun under Lon Nol’s regime, but under the Khmer Rouge, they escalated dramatically.
The Muslim Cham minority was also subjected to brutal repression. These campaigns of ethnic cleansing constituted clear acts of genocide (revolutionary violence against ethnic Khmer was a politicide and thus not covered by the United Nations definition of genocide). The Khmer Rouge leadership envisioned a revival of the ancient Khmer Empire, and as part of this vision, they launched reckless cross-border raids into Vietnam’s Mekong Delta — territory that had been Vietnamese for centuries.
Paranoia consumed the Khmer Rouge leadership. While the “new people” remained primary targets, no one was safe, and summary executions became routine. Lacking ammunition, executioners often used farm tools or suffocated victims with plastic bags.
Internal purges proliferated. Power struggles among party leaders led to conspiracies, betrayals, and mass killings. In Phnom Penh, a former high school was converted into the notorious S-21 prison (Tuol Sleng), where approximately 15,000 people — mostly Khmer Rouge members — were tortured, coerced into absurd confessions, and executed at the Choeung Ek killing fields.
As the regime’s grip on power weakened, irrational violence and mass arrests intensified. Party officials claimed to have uncovered elaborate plots involving supposed collaborations between the CIA, the KGB, Vietnamese agents, and Khmer counterrevolutionaries. The S-21 archives are filled with these fabricated confessions.
Downfall
With the revolution descending into madness, some Khmer Rouge members near the Vietnamese border fled the regime. One of them was Hun Sen, a battalion commander who had joined the Khmer Rouge in 1970. In 1977, fearing for his life, he led a small group into Vietnam and urged the Vietnamese government to intervene.
In response to ongoing border attacks and the genocide of ethnic Vietnamese, Vietnam launched a massive invasion of Cambodia on December 25, 1978, starting the Third Indochina War (1978–91), a conflict among Communist states in which the Soviet Union supported Vietnam against the Chinese-backed Khmer Rouge. Hun Sen led a small contingent of ethnic Cambodian forces alongside 150,000 Vietnamese troops. Within days, eastern Cambodia had fallen and the Khmer Rouge leadership ordered another evacuation of Phnom Penh.
On January 7, 1979, Vietnamese forces entered the capital and uncovered evidence of the Khmer Rouge’s atrocities. They quickly publicized the genocide and converted Tuol Sleng into a museum and Choeung Ek into a memorial site. The Vietnamese installed the People’s Republic of Kampuchea as a replacement regime, led by Khmer Rouge defectors.
However, the Khmer Rouge retreated into western Cambodia where they regrouped and rebranded themselves as a national resistance movement against a foreign occupier. They forged alliances with other anti-Vietnamese groups and went on to wage a civil war for over a decade. In a cynical twist of fate, the People’s Republic of China invaded northern Vietnam to punish Hanoi’s attack on their Khmer Rouge vassals.
Western leftists, such as Southeast Asia scholar Benedict Anderson, were appalled by the war among socialist states, inspiring Anderson to write his celebrated book Imagined Communities: Reflections on the Origin and Spread of Nationalism in 1983. Ironically, the United States supported the Khmer Rouge as part of a proxy war strategy against Vietnam and the USSR.
The Third Indochina War officially came to an end after the collapse of the Soviet Union, leaving hundreds of thousands of dead Cambodians and abandoned land mines maiming and killing others for decades. Yet remnants of the Khmer Rouge survived well into the 1990s. In 1998, Hun Sen’s “win-win” policy offered amnesty to thousands of troops and cadres. As they began to defect, the increasingly isolated leadership turned on itself. Pol Pot died in his sleep on April 15, just two days shy of the twenty-third anniversary of seizing the capital.
Since the party and the revolution did enjoy popular support for many years, it has been politically complicated for Cambodia’s latter-day rulers to vilify the entire movement. It is telling that in the end, the UN-sponsored Extraordinary Chambers in the Courts of Cambodia only brought charges of genocide and crimes against humanity against half a dozen Khmer Rouge leaders, several of whom were alumni of the Parisian overseas study program.
While April 30 is a day of nationalist celebration in Vietnam with massive military parades, this year, April 17 will not be marked by any significant official or informal events in Phnom Penh. This is not surprising, as Cambodia has had difficulty coming to terms with the history of the Khmer Rouge. In the interests of rebuilding the nation, silence and ambiguity have been more common than truth and reconciliation.
