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The Communist Party of India (Marxist) (abbreviated CPI(M) or CPM; Hindi: भारत की कम्युनिस्ट पार्टी (मार्क्सवादी) Bhārat kī Kamyunisṭ Pārṭī (Mārksvādī)) is a communist party in India. The strength of CPI(M) is concentrated in the states of Kerala, West Bengal and Tripura. As of 2013, CPI(M) is leading the state government in Tripura. Also leads the Left Front coalition of leftist parties. As of 2009, CPI(M) claimed to have 1,042,287 members.
CPI(M) emerged out of a division within the Communist Party of India (CPI) in 1964. The CPI(M) was born into a hostile political climate. At the time of the holding of its Calcutta Congress, large sections of its leaders and cadres were jailed without trial. Again on 29–30 December, over a thousand CPI(M) cadres were arrested and detained, and held in jail without trial. In 1965 new waves of arrests of CPI(M) cadres took place in West Bengal, as the party launched agitations against the rise in fares in the Calcutta Tramways and against the then prevailing food crisis. State-wide general strikes and hartals were observed on 5 August 1965, 10–11 March 1966 and 6 April 1966. The March 1966 general strike results in several deaths in confrontations with police forces.