He was made a permanent invitee to the
CPI(M) Central Committee in 1983 and was elected as a regular member in 1985. He was elected as a member of the
Politburo in 1998. He played a key role in building and organising the party in several parts of
West Bengal, especially undivided
Medinipur,
Bankura, and
Puruliya districts. He was also elected as the Chairman of the
Left Front in 1998, after
Sailen Dasgupta was relieved of the post due to health issues. This was the first time since 1977 that a person who was not the State Secretary of CPI(M) became Chairperson of the Left Front. Bose was also elected as State Secretary of CPI(M) in March 2005 after
Anil Biswas died suddenly. He served in the position until 2015, when
Surjya Kanta Mishra succeeded him. In 2022, he left the State Secretariat, State Committee, Central Committee, and the Politburo of CPI(M) in one go, adhering to the party's strict age limit. However, he is still serving as the Chairperson of the Left Front. Later in 2022, he was made a special invitee to the Central and State Committees of CPI(M). == References ==