Some nationalists frustrated by the failure of political struggle turned to revolutionary terrorism. They felt that the British must be physically expelled from India. They resorted to use violence against unpopular British officials, governors and viceroys. Certain newspapers like Sandhya and the Yugantar in Bengal and Kal in Maharashtra began to advocate revolutionary terrorism after 1905. Soon many secret societies of terrorist youth came into existence. The most famous of these was in Anushilan Samiti whose Dacca section alone had 500 branches. The terrorists also established centres of activity abroad. The Ghadar party was constituted in 1913 by revolutionaries in USA and Canada. They aimed at the overthrow of the British through an armed revolt. Prominent revolutionaries were Prafulla Chaki,Khudiram Bose.V Savarkar,Har Dayal and Ajit Singh.