The activists started their 'March to Nabanna' (secretariat)" programme from Rani Rashmoni Road in the Esplanade area, but shortly after they were prevented by the police to proceed further.
They then tried to break the police barricade, but having failed to do it the activists blocked the important crossing for more than an hour, throwing traffic haywire.
Later, Bengal Congress president Adhir Chowdhury lashed out at Chief Minister Mamata Banerjee over the worsening law and order situation in the state.
"It is a pity that the government is afraid even to accept a deputation from us. The TMC can't wipe us out through intimidation and violence. Why did they deploy such a huge police contingent to stop us? We were not going there to take away her chair," Chowdhury said.