Among those participating in the dharna were LDF MPs, MLAs, chairpersons of local bodies and ward members.
The dharna also had political significance as Kerala Congress (B) leader R Balakrishnan Pilla along with his son K B Ganeshkumar, MLA, participated in the stir against Congress-led ruling UDF, in which they were a partner before they broke away two months back.
"More and more evidence against Mani and Babu are coming out on the bar bribery scam', he said and added that both ministers should be subjected to a lie detector test.
LDF has been on the warpath ever since the bar scam surfaced in November last with Kerala Bar Hotel Owners Association working President Biju Ramesh levelling charges against Mani and Babu that they had taken bribes.
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LDF has alleged that though an FIR was registered against Mani in a Vigilance court after a quick verification probe by the Vigilance and Anti-Corruption Bureau, there has been no further progress in the case.
LDF has demanded a speedy and transparent probe into the scam by the Vigilance.