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 CPI(M) was born in the struggle against revisionism and sectarianism in the communist movement at the international and national level, in order to defend the scientific and revolutionary tenets of Marxism-Leninism and its appropriate application in the concrete Indian conditions. The CPI(M) combines the fine heritage of the anti-imperialist struggle and the revolutionary legacy of the undivided Communist Party which was founded in 1920. Over the years, the Party has emerged as the foremost Left force in the country.
The Kolkata district committee office of the party is situated at Promode Dasgupta Bhaban. The 23rd conference of Kolkata District committee of the party was held during 15-18 January, 2015 at Comrade Samar Mukherjee Nagar and Comrade Haridas Malakar Mancha (Promode Dasgupta Bhaban). The delegates of the conference elected Comrade Niranjan Chatterjee as the Secretary of the Kolkata District Committee.