The United Nations Border Relief Operation (UNBRO) was a donor-nation funded relief effort for Cambodian refugees and others affected by years of warfare along the Thai-Cambodian border. It functioned from 1982 until 2001.

The Khmer Rouge is the name that was popularly given to members of the Communist Party of Kampuchea (CPK) and by extension to the regime through which the CPK ruled Cambodia between 1975 and 1979. The name was coined in the 1960s by then Chief of State Norodom Sihanouk to describe his country's heterogeneous, communist-led dissidents, with whom he allied after his 1970 overthrow.