The party workers led by its state president Laxmi Kant Bajpai staged the protest at Deendayal Upadhyaya park here.
Hitting out at the PM, Bajpai alleged Singh who had previously praised the CAG is now criticising the constitutional body after it exposed the scam.
He alleged the UPA government is not cancelling allocation of the coal blocks even after CAG's report and demand of the opposition.
