The Federal Party (FP) launched a movement of non-violent resistance (satyagraha) against the bill, which prompted Bandaranaike to reach an agreement (Bandaranaike–Chelvanayakam Pact) with S. J. V. Chelvanayakam, leader of the FP, to resolve the looming ethnic conflict. The pact proved ineffective in the face of ongoing protests by opposition and the Buddhist clergy. The bill, together with various government colonisation schemes, contributed much towards the political rancour between Sinhalese and Tamil political leaders. Bandaranaike was assassinated by an extremist Buddhist monk in 1959.