Some senior members of the group were sent abroad for political and military training. One of the first batches included Surendra Mohan Bose, Tarak Nath Das and Guran Ditt Kumar, who, since 1907, were extremely active among the Hindu and Sikh immigrants on the Western coast of North America. These units were to compose the future Ghadar Party. In Paris Hemchandra Kanungo alias Hem Das, along with Pandurang M. Bapat, obtained training in explosives from the Russian anarchist Nicholas Safranski. (Source: Ker, p397.) After returning to Kolkata, he joined the combined school of 'self-culture' ("anushilan") and bomb factory run by Barin Ghosh at a garden house in Maniktala, a suburb of Calcutta. However, the attempted murder of Kingsford, the-then district Judge of Muzaffarpur by Khudiram Bose and Prafulla Chaki (30 April 1908) initiated a police investigation that led to the arrest of many of the revolutionaries. The prisoners were tried in the famous Alipore bomb conspiracy case in which several activists were deported for life to the Cellular Jail in Andaman.