In 1940, while still a student, he published his first volume of poetry "Padatik" (Pedestrian). Many critics regard this book as a milestone in the development of modern Bengali poetry. It represented a clear departure from the earlier Kallol generation of poets; and Subhash's distinctive, direct voice, allied with his technical skill and radical world-view, gained him great popularity. In his poetry, Subhash grappled with the massive upheavals of that era which ruptured Bengali society from top to bottom. The 1940s were marked by world war, famine, partition, communal riots and mass emigration in Bengal. Subhash's writings broke away from the traditional moorings of the establishment poets, and instead addressed the despair and disillusion felt by the common people. He remained throughout his life an advocate of the indivisibility of the Bengali people and Bengali culture. His radical activism continued unabated. He was one of the leaders of the "Anti-Fascist Writers' and Artists' Association", formed in March 1942 in reaction to the murder of Somen Chanda, a fellow-writer and Marxist activist. Subhash remained attached with the Communist Party until 1982, and spent time in jail as a political prisoner briefly in the late 1960s. From the late 1950s onwards, Subhash's poetry evolved into something more personal and introspective. The lyricism of "Phul phutuk na phutuk, aaj Boshonto", one of his most famous poems, was a result of this period.