Ganguly fought for Independence from a very early age and had worked closely with Dr Prafulla Chandra Ghosh, who later became the first chief minister of Bengal.
He was the chairman of Government of West Bengal's State Advisory Committee for Freedom Fighters' Pension.
Ganguly was "absolutely fine" and also visited his office at the Writers' Building yesterday, family sources said.
"He went to his younger son's place at Durganagar in Dum Dum, where he had a heart attack," the relative said.
Ganguly studied at Bikrampur Paikpara Union School, a government-aided school where he also worked as a gardener.
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His first long term imprisonment happened after he turned 18 when he was arrested for two years for gheraoing Tangluberia police station.
After that he participated in the Quit India Movement in 1942 and was arrested from Rajshahi and was jailed at Dhaka Central Jail for three years. During that time he passed his Intermediate.
In 1946, Ganguly was with Gandhi during the riots in Kolkata and Noakhali when Prafulla Ghosh had sent him to be with the Mahatma.
After the Partition of Bengal, Ganguly, was involved in the rehabilitation of refugees from East Pakistan.