The police resorted to latchicharge at Ganesh Chandra Avenue where the protesters broke barricades during the "march to Lalbazar" programme to protest against alleged police atrocity against people and their democratic rights.
A senior police officer said several police personnel were injured when Left workers resorted to brickbatting and stone- pelting.
CPI-M politburo member Mohammed Salim claimed, "Several of our leaders, including our central committee member Dipak dasgupta, were injured in the unprovoked police lathicharge."
He alleged that the brutal lathicharge was a proof of the barbaric and undemocratic attitute of the state administrtation.
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The police said that they were forced to resort to lathicharge when attacked by the demonstrators in which some police personnel received injuries.
"More than 50 police personal were injured in the attack by the protestors. We are awaiting further reports," a senior police officer said.
The Left's march to Lalbazar was organised within a month after a march to the state secretariat at Howrah which had also witnessed violence and September 2 general strike.