Sachindra Nath Sanyal (3 April 1890 — 7 February 1942) was an Indian revolutionary and co-founder of the Hindustan Republican Army (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 Chandra Shekhar Azad, Jatindra Nath Das, and Bhagat Singh.
Sachindra Nath Sanyal founded a branch of the Anushilan Samiti in Patna in 1913.
In 1912 Delhi Conspiracy Trial Sanyal with 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 And lady Hardinge died at the attack.
He was extensively involved in the plans for theGhadar 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 Kakori 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, 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 1 January 1925.
Sanyal and Mahatma Gandhi engaged in a famous debate published in Young India between 1920 and 1924. Sanyal argued against Gandhi’s gradualist approach.