More than 150 cases were filed against various persons including Mr Ramadoss, MDMK leader Vaiko and Viduthalai Chiruthaigal Katchi leader Thirumavalavan, for violating prohibitory orders.
An arrest warrant was issued against Mr Ramadoss, already lodged in the Tiruchirapalli prison in connection with the April 25 violence at Marakkanam in Villupuram district.
Judicial magistrate Ruskin Raj granted bail to the PMK leader.
Mr Ramadoss' son, former Union Minister Anbumani Ramadoss, who was arrested on May 3 for offences, including unlawful assembly and rioting at a PMK function at Mamallapuram last year, was released on Thursday from the Puzhal prison near Chennai after he secured conditional bail in cases pending against him.
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