Political history of Sri Aurobindo
Anushilan Samiti was founded as an attempt to organize Bengali youth through a program of physical fitness and spiritual training for a nationalist program. By 1902, Calcutta had three societies working under the umbrella of Anushilan Samity, a society earlier founded by a Calcutta barrister by the name of Pramatha Mitra. These included Mitra's own group, another led by a Bengali lady by the name of Sarala Devi, and a third one led by Aurobindo Ghosh. The Anushilan Samiti had Aurobindo and Deshabandhu Chittaranjan Das as the vice-presidents, Suren Tagore the treasurer. Jatindra Nath Banerjee (Niralamba Swami), Bagha Jatin, Bhupendra Nath Datta (Swami Vivekananda's brother), Barindra Ghosh were among other initial leaders.
By 1905, the work of Aurobindo and his brother Barin Ghosh allowed Anushilan Samity to spread through Bengal.
Anushilan Samiti
Through the 1920s and 1930s, many Anushilan members began identifying with Communism and leftist ideologies. Many of them studying Marxist–Leninist literature whilst serving long jail sentences. A minority section broke away from the Anushilan movement and joined the Communist Consolidation, and later the Communist Party of India. Former Jugantar leader Narendranath Bhattacharya, now known as M. N. Roy, became an influential member of the Communist International, helping to find the Communist Party of India. The majority of the Anushilanite Marxists, whilst having adopted Marxist–Leninist thinking, felt hesitant over joining the Communist Party. Holding sharp differences with the CPI and Royist ideologies, the Anushilan marxists decided to join Congress Socialist Party (CSP), but keeping a separate identity within the party. The RSP, which derived from the "Samiti", held a strong influence in parts of Bengal. The psrty sent two parliamentarians in the 1952 Lok Sabha elections, both previously "Samiti" members. In 1969 RSP sympathizers in East Pakistan formed the Shramik Krishak Samajbadi Dal (SKSD). RSP and SKSD have maintained close ties since. The RSP is a minor partner in the Left Front which ruled the Indian state of West Bengal for 34 uninterrupted years. It also holds influence in South India, notably in parts of Kerala. The SUCI, another left wing party with a presence in Bengal, was founded in 1948 by Anushilan members.