Explanation:

Sachindra Nath Sanyal was an Indian revolutionary and a founder of the Hindustan Republican Association (HRA, which after 1928 became the Hindustan Socialist Republican Association) that was created to carry out armed resistance against the British Empire in India. He was a mentor for revolutionaries like Chandrashekhar Azad and Bhagat Singh.
Sanyal founded a branch of the Anushilan Samiti in Patna in 1913.] 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 for his involvement in the conspiracy and was imprisoned at Cellular Jail in the Andaman and Nicobar Islands, where he wrote his book titled Bandi Jeevan (A Life of Captivity, 1922). 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,[1] Sanyal, Ram Prasad Bismil and some other revolutionaries who wanted an independent India and were prepared to use force to achieve their goal, founded the Hindustan Republican Association in October 1924.] He was the author of the HRA manifesto, titled The Revolutionary, that was distributed in large cities of North India on 31 December 1924.
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 in 1942.