A resistance group established in 1968 to liberate the Muslim majority Southern Thailand. PULO is the consequence of the Anglo-Siamese Treaty that split up the Malay regions formerly under the Kingdom of Siam. The insurgents were active in Yala, Narathiwat, Pattani and Satun. During the Second Malayan Emergency in the 1970s and 1980s, PULO cooperated with the Malayan Communist Party, posing a threat to Malaysian and Thai militaries. After the Hat Yai Treaty, former members of PULO migrated to Malaysia, in particular Kelantan where they speak the same Malay dialect and share the same cultural heritage.
See the Anglo-Siamese Treaty and the Kingdom of Reman, the vassal state sacrificed by the Kingdom of Siam to make for easy integration with British Malaya.