Bhagat Singh
At Calcutta, Bhagat and Chandra Shekhar Azad met Jatindranath Das, a scholar and a scientist in January 1929. Jatin was asked to make bombs, arsenals and other weapons for the HSRA. The HSRA set up a bomb factory in Agra for the purpose. In March, the arsenals were tried and tested in secret near the Yamuna River.