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TheCommunist movement in Korea emerged as a political movement in the early 20th century. Although the movement had a minor role in pre-war politics, thedivision betweenNorth KoreaSouth Korea that began in 1948 came to dominate Korean political life in the post-World War II era.North Korea, officially the Democratic People's Republic of Korea, continues to be aJuche-oriented state under the rule of theWorkers' Party of Korea.[1] In South Korea, theNational Security Law has been used to criminalize advocacy of communism and groups suspected of alignment with North Korea.[2][3]
Due to the end of economic aid from theSoviet Union afterits dissolution in 1991, the impractical ideological application ofStalinist policies in North Korea over years ofeconomic slowdown in the 1980s,[4] and therecession and famine during the 1990s,[5] North Korea has replacedMarxism-Leninism with theJuche idea despite nominally upholding Communism. References to Communism were removed in the North Korean 1992 and 1998 constitutional revisions[6] to make way for thepersonality cult ofKim's family dictatorship and the (admittedly reluctant)North Korean market economy reform.
TheWorkers' Party of Korea under the leadership ofKim Jong Un later reconfirmed commitment to the establishment of acommunist society in 2021, butorthodox Marxism has since been largely tabled in favor of "Socialism in our style". Officially, the DPRK still retains acommand economy with complete state control of industry and agriculture. North Korea maintains collectivized farms and state-funded education and healthcare.
Alexandra Kim, a Korean who lived in theSoviet Far East, is sometimes credited as the first Korean communist. She had joined theBolsheviks in 1916.[7] In 1917,Vladimir Lenin sent her to Siberia to mobilize Koreans there against the counter-revolutionary forces and the Allied Expeditionary Forces. InKhabarovsk, Kim was in charge of external affairs at the Far-Eastern Department of the Party along withCommunist International (Comintern) official Pak Chin-sun. There they met withYi Dong-hwi, Kim Rip and otherKorean independence fighters. Together they founded theKorean Socialist Party, the first Korean communist party on June 28, 1918.[8][9][10][11]
Evolving from the Socialist Party, theKorean Communist Party established two separate branches inIrkutsk andShanghai, but disputes between the two factions were irreconcilable and the party was eventually dissolved. Prominent members of theKorean provisional government in exile and activists from the1919 March First movement were attracted to the communist cause, not out of ideological affinity, but as a way to rid Korea of theJapanese occupation.Jo So'ang was once a prominent socialist along withKim Kyu-sik, who addressed the Comintern Congress of the Toiler of the Far East in 1922. Other prominent leftists includeYo Un-hyeong,Choe Chang-ik,Kim Tu-bong,Ho Hon,Yi Sang-seol and Kim Chang-man.[12][13]
TheCommunist Party of Korea was founded during a secret meeting in Seoul in 1925.[14] The leaders of the party were Kim Yong-bom andPak Hon-yong. The party became the Korean section of theCommunist International at the 6th congress of the International in August–September 1928. But after only a few months as the Korean Comintern section, the perpetual feuds between rival factions that had plagued the party from its foundation led the Comintern to disband the Communist Party of Korea in December the same year.[14][15] However, the party continued to exist through various party cells. Some Korean communists went into exile inChina, where they participated in the early years ofChinese Communist Party and theChinese Red Army. In the early 1930s Korean and Chinese communists began guerrilla activity against the Japanese forces. TheKorean Revolutionary Party formed by exiles on the left was the main political party dominating the provisional government.
After the liberation in 1945, the situation for the Korean communists changed considerably. In the South, the Communist Party leader Pak Hon-yong, who had been a resistance fighter, became active inSeoul upon his release in 1945. He reorganized aCentral Committee, of which he became the Secretary. Being based in Seoul, his group had limited contact with the Soviets in the north.
The SovietRed Army liberated northern Korea in August 1945. At the time, there were very few Communistcadres in the North. The Soviets began to rely largely on exiled Communists who returned to Korea at the end of World War II as well as ethnic Koreans who were part of the largeKorean community in the USSR.Kim Il Sung became a prominent figure of the party in the northern areas. After his years as a guerrilla leader in theNortheast Counter-Japanese United Army, Kim Il Sung had moved to the Soviet Union and had become a captain in theRed Army. His battalion arrived inPyongyang just as the Soviets were looking for a suitable person who could assume a leading role in North Korea. Other associates of Kim includesChoe Yong-gun,Kim Il andPak Kum-chol.
On October 13, 1945, theNorth Korea Bureau of the Communist Party of Korea was established. Though technically under the control of the Seoul-based party leadership, the North Korean Bureau had little contact with Seoul and worked closely with theSoviet Civilian Authority. The first chairman of the Bureau was Kim Yong-bom, who had been sent to Korea by theComintern in the 1930s to conduct underground activity. Kim Il Sung was a member of the Bureau at its founding and replaced Kim Yong-bom as chairman in December 1945. Official North Korean historians later disputed this, claiming that Kim Il Sung had become its chairman from the onset of the Bureau. Moreover, official North Korean sources claim that the meeting was held on October 10. October 10 is regarded as the 'Party Foundation Day' in North Korea, on which Kim Il Sung formed the first genuine communist party in the country. Official North Korean historians tend to seek to downplay the role of early communist leaders like Pak Hon-yong. Official North Korean sources claim that the name of the Bureau was changed to 'Organizational Committee of the Communist Party of North Korea' (often simply referred to as the 'Communist Party of North Korea').
On July 22, 1946, the North Korea Bureau joined with theNew People's Party, theDemocratic Party and theChondoist Chongu Party (supporters of an influential religious movement) to form theNorth Korean Fatherland United Democratic Front.
On July 29, 1946, the New People's Party and the North Korea Bureau held a jointplenum of theCentral Committees of both parties and agreed to merge into a single entity. A founding conference of theWorkers Party of North Korea was held on August 28–30.Kim Tu-bong, the leader of the New People's Party, was elected chairman of the party. Vice Chairmen of the party were Chu Nyong-ha andKim Il Sung.[16] At the time of establishment, the party is believed to have had about 366 000 members organized in around 12,000 party cells.[16][17]
The North Korea Bureau of the Communist Party of Korea and the New People's Party then merged into one party. The New People's Party had a significant following of intellectuals whereas the Communist Party was mainly based amongst workers and peasants. Moreover, the Korean communists had been riddled by internal differences, and different communist fractions were present in the new unified party. At the time of the founding of the new party discussions emerged on the role ofMarxism–Leninism as the ideological foundation of the party. At the inaugural congress of the party, Kim Il Sung stated that "...the Workers Party is a combat unit and the vanguard of the working masses. We must fight with our utmost to maintain the Party's purity, unity, and iron discipline. If we were to fight against the enemy without meeting these conditions within our ranks, it would be nothing less than folly.", arguing in favor of maintaining a Marxist–Leninist orientation.[16]
The remainder of the Communist Party of Korea, still functioning in the southern areas, worked under the name ofCommunist Party of South Korea. The party merged with the New People's Party of South Korea and the fraction of thePeople's Party of Korea (the so-called forty-eighters), founding theWorkers Party of South Korea on November 23, 1946.
The Workers Party of South Korea was outlawed in the South, but the party organized a network of clandestine cells and was able to obtain a considerable following. It had around 360 000 party members.[16] The clandestinetrade union movement, the All Korea Labor Union was connected to the party. In 1947 the party initiated armedguerrilla struggle. As the persecution of party intensified, large sections of the party leadership moved toPyongyang. The party was opposed to the formation of a South Korean state. In February–March 1948 it instigatedgeneral strikes in opposition to the plans to create a separate South Korean state.[18] On April 3, 1948, the party led a popular uprising onJeju island, against the unilateral declaration of the foundation of theRepublic of Korea. In the suppression of the revolt, thousands of islanders were killed (seeJeju massacre).[19]
At the time there were four separate tendencies or factions in the Workers Party of North Korea.
The factions were represented proportionately in the leading bodies of the WPNK. In the firstpolitburo of the party the Soviet Korean fraction had three members, the Yanan fraction had six, the domestic fraction had two and the guerrilla fraction had two. The guerrilla faction was actually the smallest of the fractions in theCentral Committee but they had the advantage of having Kim Il Sung, who led the North Korean government and was highly influential within the party. Moreover, Kim Il Sung was backed by the Soviet Union.
On June 30, 1949, theWorkers' Party of North Korea and theWorkers' Party of South Korea merged, forming theWorkers' Party of Korea, at a congress in Pyongyang. Kim Il Sung became the party chairman andPak Hon-yong andAlexei Ivanovich Hegay became vice chairmen.[20][21][23] The other members of the first Politburo wereYi Sung-yop,Kim Sam-yong,Kim Ch aek,Kim Tu-Bong,Pak Il-u, andPak Chong-ae.[24] Most were later purged by Kim Il Sung.[24]
The first five years of the WPK's rule were dominated by theKorean War. By October 1950,United Nations forces had occupied most of the DPRK and the WPK leadership had to flee toChina. But, in November, North Korean andChinese forces entered the war and threw the U.N. forces back, retaking Pyongyang in December and Seoul in January 1951. In March, U.N. forces retook Seoul, and the front was stabilized along what eventually became the permanent "Armistice Line" of 1953. The WPK was able to re-establish its rule north of this line.
According toAndrei Lankov, in the early years of the party Kim Il Sung was the acknowledged leader, but he did not yet have absolute power since it was necessary to balance off the interests of the various factions. To eliminate any threats to his position, he first moved against individual leaders who were potential rivals. He drove from power Alexei Ivanovich Hegay (also known as Ho Ka-ai),[24] leader of the Soviet Korean faction, first demoting him during the Korean War in 1951 and then using him as a scapegoat for slow repairs of a water reservoir bombed by the Americans to drive him from power (and to an alleged suicide) in 1953.[24]
Kim Il Sung also attacked the leadership of the Yanan faction. Lankov says that when the North Koreans were driven to the Chinese border, Kim Il Sung needed a scapegoat to explain the military disaster and blamed Mu Chong, a leader of the Yanan faction and also a leader of theNorth Korean military. Mu Chong and a number of other military leaders were expelled from the party and Mu was forced to return to China where he spent the rest of his life. Kim Il Sung also removed Pak Il-u, the Minister of the Interior[24] and reputedly the personal representative ofMao Zedong.
According to Lankov, as theKorean War drew to a close, Kim Il Sung first moved against the Domestic faction. With the end of the Korean War the usefulness of the Domestic faction in running guerilla and spy networks in South Korea came to an end. Former leaders of the Workers Party of South Korea were attacked at a December 1952 Central Committee meeting. In early 1953, rumours were spread that the "southerners" had been planning a coup. Lankov says that this led to the arrest and removal from power ofPak Hon-yong (who was foreign minister at the time) and Yi Sung-yop the minister of "state control" who was charged with "spying on behalf of the Republic of Korea".[24]
In August 1953, following the signing of thearmistice that suspended the Korean War, Yi and eleven other leaders of the domestic faction were subjected to ashow trial on charges of planning a military coup and sentenced to death. In 1955, Pak Hon-yong, the former leader of the WPSK and deputy chairman of the WPK, was put on trial on charges of having been a US agent since 1939, sabotage, assassination, and planning a coup. He was sentenced to death, although Lankov says it is unclear if he was shot immediately or if his execution occurred some time in 1956.[24]
Lankov says that the trials of Yi and Pak were accompanied by the arrest of other members and activists of the former WPSK with defendants being executed or sent to forced labour in the countryside. The domestic faction was virtually wiped out, though a few individual members who had personally allied themselves to Kim Il Sung remained in positions of influence for several more years.

Kim Il Sung advancedJuche as a slogan in a December 28, 1955, speech titled "On Eliminating Dogmatism and Formalism and EstablishingJuche in Ideological Work". TheJuche Idea itself gradually emerged as a systematic ideological doctrine under the political pressures of theSino-Soviet split in the 1960s. The word "Juche" also began to appear in untranslated form in English-language North Korean works from around 1965. Kim Il Sung outlined the three fundamental principles ofJuche in his April 14, 1965, speech "On Socialist Construction in the Democratic People's Republic of Korea and the South Korean Revolution". The principles are "independence in politics" (chaju), "self-sustenance in the economy" (charip) and "self-defense in national defense" (chawi).
WPK ideologists and speech writers began to openly use Maoist ideas, such as the concept of self-regeneration, in the 1950s and 1960s. Maoist theories of art also began to influence North Korean musical theater during this time. These developments occurred with the backdrop of theSino-Soviet split.
In official North Korean histories, one of the first purported applications ofJuche was the Five-Year Plan of 1956–1961, also known as theChollima Movement, which led to theChongsan-ri Method [ja] and theTaean Work System [ja]. The Five-Year Plan involved rapid economic development of North Korea, with a focus onheavy industry. The Chollima Movement, however, applied the same method of centralized state planning that began with the Sovietfirst five-year plan in 1928.
In 1972,Juche replacedMarxism–Leninism in the revised North Korean constitution as the official state ideology, this being a response to theSino-Soviet split.Juche was nonetheless defined as a creative application of Marxism–Leninism. Kim Il Sung also explained thatJuche was not original to North Korea and that in formulating it he only laid stress on a programmatic orientation that is inherent to all Marxist–Leninist states.
Former North Korean leaderKim Jong Il officially authored the definitive statement onJuche in a 1982 document titledOn theJuche Idea. After the 1991collapse of the Soviet Union, North Korea's greatest economic benefactor, all reference to Marxism–Leninism was dropped in the revised 1992 constitution.[26] Kim Jong Il incorporated theSongun (army-first) policy intoJuche in 1996. The communist-style central leadership structure would be removed from the North Korean government in the revised 1998 constitution, which abolished both the office of President and the Central People's Committee and transferred their powers to thePresidium of the Supreme People's Assembly and theCabinet.[26] In contrast to the previous authority of the rulingWorkers' Party of Korea (WPK) leadership, the 1998 constitutional amendment also redirected supreme state power leadership to those who lead theNorth Korean military;[26] despite redirecting supreme leadership to the North Korean military, the language of the 1998 amendment did not call for the WPK to be abolished.[26]
In 2009, all references tocommunism were removed from theNorth Korean Constitution. In 2012, North Korea took down portraits ofKarl Marx andVladimir Lenin from the walls of theMinistry of Foreign Trade.[27] However, in January 2021, the WPK reasserted its commitment to communism.[28] In 2024, the portraits of Marx and Lenin were displayed in the newly opened Central Cadres Training School of the Workers’ Party of Korea.[25]