"Achuthanandan is spreading lies with the deliberate intention of defaming me," Chennithala said at a meet-the press programme here while referring to the Marxist veteran's statement that nine Vigilance cases are pending against him.
"Not a single case is pending against me," he said and added that there was no case against Chief Minister Oommen Chandy also.
Achuthanandan had alleged that there were 31 cases pending against Chandy in the Apex Court and 136 corruption cases against 18 UDF ministers.
Referring to the political situation in the run-up to the May 16 polls, Chennithala said CPI(M) in Kerala is the party's main political enemy and attacked it, saying the communist party believes in political violence.
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"It will be authoritarian rule in Kerala if CPI(M) politburo member Pinarayi Vijayan becomes Chief Minister, if the party comes to power," he said.
However, there was no such possibility as the political climate in the state was in favour of UDF, Chennithala said.
He said BJP would fail to open is account in Kerala this time also as it has in the past.
Chennithala said Congress felt that a unity of secular democratic forces, including the Left, was necessary to take on the challenges posed by BJP at the national level.