At a very early stage of his life Chattopadhyaya immersed himself in the left nationalist movement by joining the Association of Progressive Writers, which was formed in 1936.
Zu einem sehr frühen Zeitpunkt in seinem Leben tauchte Chattopadhyaya in die links-nationalistische Bewegung ein, indem er der 1936 gegründeten Progressive Writers' Movement (Bewegung progressiver Schriftsteller) beitrat.