It occurred in Naxalbari of Siliguri subdivision, Darjeeling district under the leadership of communist leaders like Charu Majumdar and others who later became the part of CPI (ML). In the Srikakulam district of Andhra Pradesh, communist leaders aligned themselves with the then formed AICCCR and launched peasant upsurge in Srikakulam which continued for almost 5 years in late 1960s and early 1970s. The first party congress was held in Calcutta 1970. A Central Committee was elected. As a result of both external repression and a failure to maintain internal unity, the movement did however degenerate into extreme sectarianism. Instead of popular armed struggle in the countryside, individual terrorism in Calcutta became a principal method of struggle. In 1971 Satyanarayan Singh revolted against the leadership, "individual killing of people branded as class enemy" and sectarianism of Majumdar. The result became that the party was split into two, one CPI (ML) led by Satyanarayan Singh and one CPI (ML) led by Majumdar. In 1972, frail and broken Majumdar died of multiple diseases in police custody; after his death a series of splits took place during the major part of the 1970s. The naxalite movement suffered a period of extremely harsh repression that rivaled the Dirty Wars of South America at the same time that the movement got all more fragmented. After Majumdar's death the CPI (ML) central committee split into pro- and anti-Majumdar factions. In December 1972 the Central Committee of the pro-Charu Majumdar CPI (ML) led by Sharma and Mahadev Mukherjee adopted resolution to follow the line of Charu Majumdar unconditionally which others did not agree to. The pro-Charu Majumdar CPI (ML) later split into pro- and anti-Lin Biao factions. The pro-Lin Biao faction became known as Communist Party of India (Marxist–Leninist) (Mahadev Mukherjee) and the anti-Lin Biao-group later became known as Communist Party of India (Marxist–Leninist) Liberation  and was led by Jauhar, Vinod Mishra, Swadesh Bhattacharya. Today, there exist a large number of political organizations whose roots are in the AICCCR/CPI (ML). Only C.P.I (M-L) faction led by Mahadev Mukherjee follows Charu Majumdar's concept of armed revolution and annihilation, whereas others have condemned the excesses of the sectarian epoch.