Hundreds of Left-backed protesters tried to enter the Bidhannagar police commissionerate on their demand.
PDS leader Samir Patitunda alleged that the police manhandled the agitators without any provocation.
CPI(M) leader Shymal Chakrabarty complained that police heckled and roughed up the agitators.
"We are planning to file a complaint against the police for this," Chakrabarty said.