The Chief Minister and the UDF government are in the dock after the exposure of the solar panel scam, Yechury said.
Yechury alleged that Chandy's office had links with the perpetrators of the fraud involving the supply of solar equipments--Biju Radhakrishnan and Saritha Nair--who are in jail following complaints from businessmen and others who had been cheated by them.
"When evidence came to light of the chief minister having a personal involvement in the affair, he sought to deny any links.
He said the scam became murkier with various telephone calls of the suspects to the home minister and other ministers coming to light.
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Yechury noted that a personal assistant of Chandy is now in custody after his links with the scamsters was established and three others belonging to the chief minister's office staff have been removed.
"Democratic norms and morality require that the chief minister resign forthwith. Kerala is witnessing a resolute mass struggle to ensure that this happens," he added.