The CPI-M on Friday denounced the "police brutality" against Left legislators inside the Kerala assembly and on its supporters outside when the state budget was being presented.
A statement from the Communist Party of India-Marxist said as many as 20 legislators were seriously injured in the police attack and some have been admitted to the intense care unit of hospitals.
"The CPI-M strongly condemns the (Oommen) Chandy government's use of police to brutally attack LDF (Left Democratic Front) MLAs inside the assembly and against the public outside the assembly premises."
It said its legislators and supporters wanted that Finance Minister K.M. Mani should not present the budget as there "is a vigilance probe against him".
"Such attempts to stifle democratic protests by the people and their representatives will not be tolerated," it said.