The Communist Party of India (Marxist) (abbreviated CPI(M) or CPM) is a communist party in India. The party emerged from a split from the Communist Party of India in 1964. The CPI(M) was formed at the Seventh Congress of the Communist Party of India held in Calcutta from October 31 to November 7, 1964. The strength of CPI(M) is concentrated in the states of Kerala, West Bengal and Tripura. As of 2015, CPI(M) is leading the state government in Tripura. It also leads the Left Front coalition of leftist parties. As of 2013, CPI(M) claimed to have 1,065,406 members.