In 1923, Nag joined
Leela Roy's Srisangha, a nationalist organisation of undivided
Bengal, and began participating in the revolutionary movement after completing high school. Nag was first arrested on 21 April 1932 and was sent to Deuli prison camp for seven years, where he took part in Communist consolidation and was attracted to the ideology of
Marxism by a senior revolutionary, Rebati Barman. After his release in 1938, he joined the
Communist Party of India. After the
Partition of India in 1947, he secretly led the East Pakistan Provincial Communist Party under the pseudonym "Rahman Bhai" from 1947 to 1972. He was the founder of the
trade union movement of
Narayanganj. Thereafter, Nag became the General Secretary of East Pakistan Provincial Communist Party He posthumously received the Friends of Liberation War Award in 2012 from the
Bangladesh government. ==References==