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The Khmer Issarak (Free Khmer, or Independent Khmer) (Khmer: ខ្មែរឥស្សរៈ) was a "loosely structured" anti-French and anti-colonial independent movement. Besides, the movement was labelled as “amorphous”. The Issarak was formed around 1945 and composed of several factions each with its own leader. Most of the Issarak bands fought actively between 1945, at the end of the Second World War to 1953, Cambodia’s independence. Initial objectives of the Khmer Issarak was to fight against the French in order to gain independence. Later, overthrowing the Cambodian government became some Issarak bands' agenda.  Moreover, the term Issarak originally referred to non-communist, but in the early 1950s the Việt Minh guided-guerrillas called themselves Issaraks for the sake of unifying other non-communist forces.
Poc Khun, a highborn Khmer founded a movement in Bangkok in 1944, and called it Khmer Issarak. It is the first time that the term "Khmer Issarak" was used. Some of the early founded Issaraks were backed by the Thai authoritative government. From the end of the Second World War to 1948, the Thai government had a policy to support a large number of guerrilla forces, which operated along the Thai frontier and in the two Thai ruled provinces, Battambang and Siem Reap. Among those groups which were aided by Thailand, some of the members later established right-wing and left-wing bands, including Son Ngoc Minh, Sieu Heng and Tou Samouth. These guerrillas formed a government in exile in Bangkok in 1945. After 1948, several of the Thai sponsored Issaraks dissolved or cooperated with the Phnom Penh government, which led by Prince Sihanouk. 
Soon afterwards, the Vietnamese guided-Issaraks formed the Khmer Issarak Association, continued armed struggles against the Khmer authorities. In the 1950s, the Viet Minh controlled-Issarak groups eventually transformed into communist organizations, for instance, the Khmer People’s Revolution Party (KPRP). Several significant figures in the Democratic Kampuchea who participated in the Cambodian Civil War, were closely related to the Viet Minh influenced-Issaraks.
During the one decade armed struggles, there was some coordination between factions. However, in most cases, different bands fought independently. Even in 1953, a year when Cambodia gained independence, the anti-French war still led by disparate leaders, divided geographically and ideologically.
After the Geneva Conference in 1954, due to the agreement, most of the Viet Minh guided-Issaraks exiled to the Democratic Republic of Vietnam (DRV) or turned underground and formed communist organizations. At the same time, as Cambodia had already gained independence from the French, most of the nationalist Issaraks and some of the communist groups disarmed themselves. Several powerful Issarak leaders such as Dap Chhuon and Prince Norodom Chantaraingsey allied with the Sihanouk government in different periods of time. The Khmer Issarak movement faded eventually.
Non-Communist Issarak Groups
During the independent movement, non-communist Issaraks that based in the northwest dominated the anti-French war which lasted for around 10 years. Those Issarak groups fought throughout the entire state. The non-communist guerrillas often coordinated battles with the Viet Minh-led Issarak forces. Among the non-communist bands, Poc Khun, Dap Chhuon, Prince Chantaraingsey’s were the most prominent.
Furthermore, short term goal of the Thai supported Issarak movement was to conduct propaganda that anti-French colonialism in the ceded provinces, which under Thai controlled from 1941-1946. Nevertheless, ultimate purpose of the movement was to liberate the French Indochina colony entirely. However, after the rightist military coup and the Pridi administration was overthrown in Thailand in November 1947, the new government reduced support and forced the Issaraks came back to Cambodia.
There were two consequences of the Thai Prime Minister Phibun returned. First of all, with the Thai cutting their aids, the Viet Minh became one of the few sources that the Issarak groups could rely on. Secondly, a permanent split in Cambodian independent movements between communist and non-communist took place. Due to a large number of guerrilla groups were not willing to work with the Viet Minh, some of them set up strong bases and became warlords, but the majority dissolved.
The first time that the term "Khmer Issarak" was employed was in 1944, after the new Thai Prime Minister Khuang Aphaiwong who took office under the guide of the King Pridi and his Free Thai movement. Soon a movement called Khmer Issarak was founded by Poc Khun, who used to work in the Publicity Department in Bangkok. Poc Khun was born in a high-ranking aristocratic family in Phnom Penh and coincidently was the uncle of Prince Monireth’s wife.  In August 1946, Poc Khun was the leader of the Khmer Issarak in Battambang province, and was elected as a representative to the House of Representatives from a district in Battambang. He continued to hold office until 1947, even after the province was returned to Cambodia.
Before the rightist wing coup in Bangkok in late 1947, a jointly Khmer Issarak-Viet Minh commanded guerrilla group was founded in the Thai capital in February. Dap (Sergeant) Chhuon became the commander of the group. Chhuon was a former Cambodian militia and an active Issarak. With the Thai support, he had organized anti-French guerrilla forces in the ceded provinces since 1943. Chhuon believed in supernatural power and often launched natural ceremonies before his battles. By early 1948, Chhuon was the leader of Viet Minh-associated Khmer People’s Liberation Committee.
Although Dap Chhuon’s army was jointly commanded with the Viet Minh initially, and he was the president of KPLC, Chhuon himself was not a communist neither his soldiers received Viet Minh training. In 1949, Dap Chhuon rallied with Sihanouk, while the negotiation took a year to reach agreement. In exchange for the submission, Chhuon received administrative and military carte blanche over Siem Reap, which became his fief very soon. After rallying with the King, Chhuon had been appointed as director of security, for the sake of overseeing the 1955 election, and minister of interior in 1957. Ten years after his submission, Chhuon, who was the governor of Siem Reap, military commander of the northwest, was accused of attempting to overturn Sihanouk’s government, and later he was shot by Lon Nol’s man near Siem Reap in February 1959.
Communist Issarak Groups
Unlike Dap Chhuon and his army, who were not communist, Sieu Heng, Long Bunruot, Son Ngoc Minh and Tou Samouth, were significant communist fighters in Cambodia and their guerrillas were heavily influenced by the Viet Minh. In provinces close to Vietnam, Vietnamese ideologies, organizations and units played critical roles in developing the anti-French resistance. Political schools were set up by the Indochina Communist Party (ICP) in those bordering provinces. Most of the students were Cambodian who were recruited by the Vietnamese, and they were taught about Marxism-Leninism and significance of cooperating with the Vietnamese. However, as Khmer communist organizations had to subordinate to the victory of the First Indochina War, only at most 5700 soldiers fought the French with the Vietnamese in Cambodia.
Sieu Heng was commander of communist Khmer Issaraks, who became a communist in 1945. He led the military resistance against the French in the 1950s but dropped out of politics afterward. After Son Ngoc Minh left for Hanoi in the mid-1950s, Heng was in charge of communist movements inside Cambodia. Around 1955 election, Heng became a secret agent to Sihanouk and later openly defected to the government, with providing information about revolutionaries to Lon Nol. At the same time, he claimed that “making revolution was impossible”. In 1975, Heng was killed by his wife’s nephew, Long Bunruot.
Long Bunruot, joined the Thai Communist Party in 1946, when he was a student at Thammasat University in Bangkok. After the independence in 1953, Long Bunruot remained revolutionary and continuously fought against the Sihanouk government as an Issarak leader. At the end of the civil war, he became the second vital figure of the Communist Party of Kampuchea (CPK), and better known as Nuon Chea.
Son Ngoc Minh
Achar Mean, a Khmer monk took his name later as Son Ngoc Minh, in order to link with the former Cambodian Prime Minister Son Ngoc Thanh and the Viet Minh leader Ho Chi Minh. Son joined the ICP in 1945. He was the first Cambodian who joined the Vietnamese dominated organization. After commanding the Cambodian communist to fight the French in the First Indochina War, Son moved to northern Vietnam in 1955 and died in 1972.
In 1950, as a representative of the Cambodia communist, Son Ngoc Minh met Viet Minh’s representatives with Sieu Heng, Tou Samouth and others at Hatien, southern Vietnam, which near Cambodian border. He analysed the revolutionary situation in Cambodia and stated due to the weak “principle force”, Cambodia could hardly have a revolution. Later, the “First National Congress of Khmer Resistance” was held in Cambodia, on the meeting, Khmer Issarak Association and People’s Liberation Central Committee (PLCC) was founded. Minh was the president of the PLCC, which consisted of all former ICP members. Two months later, as the Viet Minh guided-Issarak controlled one third of the Cambodian territory, Minh declared Cambodia’s independence, three years before Sihanouk’s government gained independence from France.
Achar Sok was an outstanding Buddhist scholar and active communist, who took a revolutionary name of Tou Samouth in 1948. At the time of his assassination, he was the secretary of the CPK’s central committee, interior minister of the Committee of Liberation of the Southeast. Years before his assassination in 1962, Tou Samouth was a patron of a young French educated Khmer, who work as Tou Samouth’s secretary. The young man was Saloth Sar, better known as Pol Pot after the establishment of Democratic Kampuchea.
Legacy of the Issarak movement
On 1 February 1948, the Issarak movement formed the Khmer Peoples Liberation Committee with Chhuon as its president. Five of its eleven leaders were sympathetic to the Vietnamese, which eliminated certain elements of the Issarak movement. Though Chhuon was nominally anti-communist, the organisation also had two important Viet Minh supporters: Sieu Heng, who was the head of the ICP North-Western branch, and his nephew Long Bunruot.
By this time the Viet Minh was leading a concerted attempt to foster Issarak's anti-colonialism and to turn it into support for communism in general, and Vietnamese communism in particular. This was especially the case on the eastern side of the country, where guerrilla cells were often commanded by Vietnamese. On the other side of the country, Son Ngoc Minh returned from Thailand with enough weapons to equip a fairly large company. In 1947 he established the Liberation Committee of South-West Kampuchea (this is particularly of note, because by the end of the civil war of 1970-75 the south-west had one of the most powerful and well organised communist armies in Cambodia, and which would form the main core of Pol Pot's support). By late 1948 many areas of the country were under the effective control of powerful Issarak organisations.
By 1949, however, the Issarak movement in this form was coming to an end: the French began to exploit the greed of some Issarak leaders by giving them colonial positions, while others went off to join more radical organisations. Chhuon's KPLC expelled Sieu Heng and the majority of the other leftists, and remodelled itself as the Khmer National Liberation Committee, with Prince Chantaraingsey as its military commander. Tou Samouth and the other leftist Issaraks formed the United Issarak Front, which had heavy Vietnamese involvement. Chhuon went over to the French, while Chantaraingsey eventually left the KNLC and aligned with the right-wing, anti-monarchical Khmer nationalists, the Khmer Serai, under Son Ngoc Thanh. The Khmer Issarak were notorious for their violence during this period, known for torture and arbitrary executions.
Foundation of the Democratic Kampuchea
Not only would the guerrilla tactics and organisation of the Issarak forces be mimicked by the communist forces during the Cambodian Civil War, but many later communists were first introduced to the concepts of Marxist-Leninism whilst involved with the Issaraks. In the eastern area of Cambodia, the leaders of those Viet Minh-influenced forces remained largely unchanged up to and beyond the establishment of Democratic Kampuchea. Until purged by Pol Pot in 1976, their forces not only wore differing uniforms to those of Pol Pot loyalists, but were noted to be exemplary in their treatment of the civilian population and to retain a certain degree of loyalty to Sihanouk.
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