The six activists of 'Makkal Adhikaram' were booked by police for allegedly making inflammatory speeches at the event held on February 14 at Tiruchirappalli.
'Makkal Adhikaram' is a group with Left-leanings and running a campaign seeking closure of state-run liquor outlets.
The activists were also booked under other IPC sections including 504 (Intentional insult with intent to provoke breach of peace) on March 26, police said.
Referring to both cases, MDMK general secretary and coordinator of PWF, Vaiko said he "strongly condemned" the police action. "The case against Makkal Adhikaram activists should be withdrawn immediately," he said, adding the people would show their resolve against such things in the May 16 polls.
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Speaking to reporters at Madurai, senior BJP leader and party election incharge for Tamil Nadu, Prakash Javadekar slammed the authorities for slapping criminal case against the activists.
"Liquor has ruined poor families," he said and blamed both ruling AIADMK and DMK over the issue.