Bagchi hailed from Shivdas Bhaduri Street,
Shyampukur area of
Kolkata,
West Bengal. His father's name is Ranjit Kumar Bagchi. Bagchi became the secretary of the Central Military Commission and Politburo member of
CPI (Maoist). He has close relation with
Kishanji at the time of
Lalgarh movement in West Bengal. He was in charge of Eastern Regional Committee of the party, known there as Alokji and asked local leaders to tie up with Assamese tribal like
Khasis,
Rabhas and
Garo people.
Jharkhand Police arrested Bagchi and Tauhid Mulla alias Kartik, West Bengal State Committee member from the Hatia Patna Intercity Express at
Ranchi on 19 August 2009. On 23 August 2010, he was sentenced to life imprisonment by a fast-track court. Bagchi is detained at present Birsa Munda Central Jail of Ranchi. After eight years in prison, his sentence was suspended. As part of
Karimnagar case he was granted bail on 29 January 2024, but on 19 July this decision was overturned. On 27 August 2024, he went on hunger strike in
Hyderabad Central Jail. ==References==