"KC-M's decision to quit UDF is opportunist politics as they left without any valid and just reason," KPCC President V M Sudheeran told reporters.
"It is not equidistance policy, but opportunist politics," Sudheeran said, attacking KC(M) supremo Mani.
He rejected Mani's charge that a section in Congress had tried to weaken and "insult KC-M and its leaders."
"Congress party leaders worked for the victory of KC-M candidates in the last polls and only wanted to strengthen that party...It is painful that they left the Front," he said.
"All decisions in the bar bribery scam were taken based on general consensus arrived by Congress leaders," he said.
Congress also did not denounce Mani over the scam and protected him even after it suffered setback, Sudheeran said.
Referring to the KC-M leader's remark that they have been "insulted" by Congress, Sudheeran said Mani did not lodge a complaint with the Front about any issue before or after the assembly polls.
Former Chief Minister Oommen Chandy, who was deputed by the party to hold talks with Mani, said KC(M) leader's decision was "unfortunate". "Congress has tried to sort out all issues," he said.
Reacting to the development, Opposition leader Ramesh Chennithala said Mani will remain only where there is power.
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CPI-M state secretary Kodiyeri Balakrishnan said KC-M quitting the Front "is the beginning of UDF's disintegration. UDF has no future in Kerala and it is better to dismantle the Front," he said.
"It is not the policy of CPI-M to gain the support of minorities by wooing any party," he added.
Meanwhile, Youth Congress activists waved black flags against Mani as he was leaving the meeting venue at Charalkunnu.
Police had a tough time controlling the Youth Congress activists and KC-M who tried to protect Mani.
