 He was held in Delhi on 8 January 1943 to be freed only on 3 April 1946 after which he continued his nationalist and trade union work.With Shibnath Bannerjee he worked very hard to form the railway men's union from 1936 onwards.He unionized the workers of Japla, Baulia, and Dalmianagar in Shahabad; Gaya, Jamshedpur and Kanda; of the coalfields of Jharia, Hazaribagh, Kumardhubi; workers of Patna City, Jamalpur; the sugar factory workers of Harinagar and Marhawra; the workers of Talcher and Rajgangpur in Orissa; and Satna in the Central Provinces.