 She returned to Assam after her marriage and formed two organizations, "Shanti Bahini" and "Mrityu Bahini".In September 1942, Das and her comrades of "Mrityu Bahini" led a protest to the local police station holding the National Flag of India and it was at this procession, the police opened fire which led to the death of her colleague, Kanaklata Barua.By that time, she had already become a member of the All India Congress Committee and the convener of the women’s wing of the Assam Congress Committee and reportedly worked to get Assam out of the grouping with East Pakistan.