The CPI (M) was born into a hostile political climate. At the time of the holding of its Calcutta Congress, large sections of its leaders and cadres were jailed without trial. Again on 29–30 December, over a thousand CPI (M) cadres were arrested and detained and held in jail without trial. In 1965 new waves of arrests of CPI(M) cadres took place in West Bengal, as the party launched agitations against the rise in fares in the Calcutta Tramways and against the then-prevailing food crisis. Statewide general strikes and hartals were observed on 5 August 1965, 10–11 March 1966, and 6 April 1966. The March 1966 general strike resulted in several deaths during confrontations with police forces.