[1] Roy joined in Communist Party of India in 1963 and led trade union movements in Bansdroni area of Kolkata.
After the seventh Congress in 1964, he joined Communist Party of India (Marxist) and mobilized group of workers against the imperialist Vietnam War.
In 1966, Roy was at the forefront of the food movement of West Bengal, facing police atrocities and became arrested.
[2] In 1980 he became the general secretary of erstwhile Maoist Communist Centre of India (MCC) and the post he till kept in 1996.
He died at the age of 78 in Urology isolation ward in All India Institute of Medical Sciences, Delhi on 18 June 2014.