Despite heavy rains, LDF activists took part in the dharna that began at 10 AM under the leadership of CPI-M state secretary Pinarayi Vijayan.
Speaking on the occasion, Vijayan said the agitation was for the resignation of Chandy and a judicial probe into the issue and not for toppling the UDF government.
The propaganda that the agitation was to bring down the government was with a view to protecting Chandy, Vijayan said.
LDF MPs, MLAs and senior leaders of the Front participated in the dharna.
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Solar scam pertains to defrauding a large number of people to the tune of crores of rupees by Saritha Nair and her accomplice Biju Radhakrishnan by offering solar energy solutions.
It attained political significance after the arrest of a Private Assistant of Chandy and removal of two others from the CM's office for their alleged link with the solar case accused.