Bhattacharya, also a labour leader and former member of CPI(M) state committee, died at a private hospital in south Kolkata, he said.
He was suffering from old-age-related health issues, the party leader said, adding that the 75-year-old CPI(M) leader is survived by his wife.
Bhattacharya was a Rajya Sabha member from 1981 to 1988, he said. PTI AMR SBN SBN