"He (Ritabrata) didn't attack Mamata. They had gone there for a protest. They didn't go to hurt anyone but people from outside had joined," Bose, who is the CPI(M)'s state secretary, told reporters here.
State finance minister Amit Mitra was manhandled and heckled while Banerjee faced ire of Left activists outside the Yojana Bhavan in New Delhi last April while protesting the death of a SFI worker in Kolkata.
He was yesterday elected to the Rajya Sabha.