A police official said the Left peasants' organisations, which assembled at the Rani Rasmoni Road in the heart of the city, were scheduled to march to the state secretariat Nabanna across the Hooghly in support of their demand for security for farmers and development of agricultural conditions in the state.
The rally was led by the state opposition leader Surjya Kanta Mishra and other Left leaders from Rani Rashmoni Road area.
During the lathicharge several protestors, including women and elderly, were injured following which the crowd allegedly started pelting stones and brickbats resulting in a clash between the police and protestors, the official said.
Meanwhile, the processionists claimed that several leaders of the Left Front, including Chairman Biman Bose, were injured during the lathicharge.