Communist partisans were active before, during and after the Korean War in South Korea.
They are considered the remnants of the Korean People's Army of the Democratic People's Republic of Korea (DPRK), prior insurgents who had fought against the Republic of Korea (ROK) before the KPA invaded, as well as local civilians who supported the DPRK in the region that either the KPA or the partisans had occupied.
By October 1950, the number of Communist guerrilla troops south of the thirty-eight parallel reached over 15,000.
[2] The ROK deployed two divisions from October 1950 to May 1951 and with American aid destroyed the majority of the Communist partisans in Jirisan during multiple campaigns, with the final campaign, Operation Rat Killer, successfully destroying the insurgency in Jirisan.
Against this decision, turmoil in the south begins, and USMGIK tried to calm down civil violence in the south by banning strikes on December 8 and outlawing the revolutionary government and the people's committees on December 12, 1945.