Read the following paragraph and extract the answer for the question: Who were the refugees that the Cambodian government was criticized for its forcible repatriation?

In the 1960s, the ascendant Khmer Rouge forged an alliance with ethnic minorities in Ratanakiri, exploiting Khmer Loeu resentment of the central government. The Communist Party of Kampuchea headquarters was moved to Ratanakiri in 1966, and hundreds of Khmer Loeu joined CPK units. During this period, there was also extensive Vietnamese activity in Ratanakiri. Vietnamese communists had operated in Ratanakiri since the 1940s; at a June 1969 press conference, Sihanouk said that Ratanakiri was "practically North Vietnamese territory". Between March 1969 and May 1970, the United States undertook a massive covert bombing campaign in the region, aiming to disrupt sanctuaries for communist Vietnamese troops. Villagers were forced outside of main towns to escape the bombings, foraging for food and living on the run with the Khmer Rouge. In June 1970, the central government withdrew its troops from Ratanakiri, abandoning the area to Khmer Rouge control. The Khmer Rouge regime, which had not initially been harsh in Ratanakiri, became increasingly oppressive.  The Khmer Loeu were forbidden from speaking their native languages or practicing their traditional customs and religion, which were seen as incompatible with communism. Communal living became compulsory, and the province's few schools were closed. Purges of ethnic minorities increased in frequency, and thousands of refugees fled to Vietnam and Laos. Preliminary studies indicate that bodies accounting for approximately 5% of Ratanakiri's residents were deposited in mass graves, a significantly lower rate than elsewhere in Cambodia.After the Vietnamese defeated the Khmer Rouge in 1979, government policy toward Ratanakiri became one of benign neglect. The Khmer Loeu were permitted to return to their traditional livelihoods, but the government provided little infrastructure in the province.  Under the Vietnamese, there was little contact between the provincial government and many local communities. Long after the fall of the Khmer Rouge regime, however, Khmer Rouge...
user
Degar
assistant