Sanyal founded a branch of the
Anushilan Samiti in
Patna in 1913. In 1912 Delhi Conspiracy Trial Sanyal along with
Basanta Kumar Biswas and
Rashbehari Bose attacked the then
Viceroy Hardinge while he was making entry into new capital of Delhi after annulment of Bengal Partition. Hardinge was injured but lady Hardinge was unscathed. He was extensively involved in the plans for the
Ghadar conspiracy, and went underground after it was exposed in February 1915. He was a close associate of
Rash Behari Bose. After Bose escaped to Japan, Sanyal was considered the most senior leader of India's revolutionary movement. Sanyal was sentenced to life - term imprisonment for his involvement in the conspiracy He was briefly released from jail but when he continued to engage in anti-British activities, he was sent back and his ancestral family home in Benaras was confiscated. Following the end of the
Non-cooperation movement in 1922, He was the author of the HRA manifesto, titled
The Revolutionary, that was distributed in large cities of North India on 1 January 1925. Sanyal was jailed for his involvement in the
Kakori conspiracy but was among those conspirators released from
Naini Central Prison in August 1937. Thus, Sanyal has the unique distinction of having been sent to the Cellular Jail in
Port Blair twice. He contracted
tuberculosis in jail and was sent to
Gorakhpur Jail for his final months. He died on 7 February 1942. ==Beliefs==