[1] His father was the owner of a banking business started by his great-grandfather and his mother was the granddaughter of Raghunandan Mitra, the Dewan of the Nadia Raj.

[2] In 1914, Sarkar and Bose ran away from home in search of a spiritual guru and travelled to Ayodhya, Haridwar, Mathura, Vrindavan and Varanasi.

Subhas Chandra Bose, who had already arrived in England a few months back, started making arrangements for Sarkar's admission and lodging at his own college, Fitzwilliam Hall in the University of Cambridge, so that they could be together once again.

At the call of Chittranjan Das, Sarkar declined the scholarship to study in England and gave up his lectureship at the University of Calcutta to join the freedom movement, a decision which he rued later.

On 7 December 1921, Sarkar was arrested by the British colonial police and sentenced to six months rigorous imprisonment under the Criminal Law Amendment Act for selling Khadi on College Street in Kolkata.

At his trial, Sarkar told the judge "As I consider myself to be a free Indian, I deny the jurisdiction of this court set up by the British falsely in the name of law and order.

Later he was shifted to a larger cell which he shared with Chittaranjan Das, Birendranath Sasmal and Subhas Chandra Bose.

On 1 November 1925, he along with Muzaffar Ahmed, Kazi Nazrul Islam, Qutubuddin Ahmad and Shamsuddin Hussain founded the Labour Swaraj Party in Bengal.

[3] In July 1927, Sarkar took up the post of Home Minister to His Highness the Raja of Dewas, Malhar Rao Powar.

In 1928, the regional tenants conference was held at the Jatindra Mohan Hall in Kushtia presided over by Muzaffar Ahmed.

Subsequently, Sarkar returned to Bengal and settled in Kushtia in Nadia from where he used to edit and publish the Bengali weekly Jagaran.

In March 1929, the regional tenants conference was presided over by Sarkar himself where Philip Spratt, Muzaffar Ahmed, Abdul Halim and others spoke.

[3] In 1929, Sarkar's Kushtia house and the Jagaran printing press were raided by the British colonial police, as part of investigations into the Meerut Conspiracy Case.

From 1935 to 1940, Sarkar tried his hand at a few roles in the business world, with companies such as the New India Assurance Co., New Asia Life Insurance Co., but he was not successful.

He became the managing director of the New India Steam Navigation Co. and started a passenger and cargo line between Kolkata and Yangon.

Even in his last writings, he continued to propose that the news of Bose's death in an air crash was wrong, and that he would return to India soon.