Senior party leader and filmstar Anandraj quit the party in an apparent fallout with the close aide of late Chief Minister J Jayalalithaa.
Anandaraj said he had no personal enmity with anyone in AIADMK but regretted the 'misuse' of Jayalalithaa's name by some in the party and the government.
On the violence outside the AIADMK headquarters, the party spokesperson C R Saraswathy blamed expelled M P Sasikala Pushpa for being behind the incident in which a man, believed to be the latter's lawyer, was "thrashed" by a group of alleged AIADMK supporters, which left him bleeding.
It was felt she could even try to contest for the top post.
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Pushpa had been reportedly questioning Sasikala's eligibility for appointment as the new General Secretary, a demand being made by a section of party workers.
"Sasikala Pushpa wants to create a law and order problem ahead of the General Council tomorrow. Let her resign first as MP as it was Amma who made her the Rajya Sabha Member," Saraswathy said.
"She (Pushpa) is no more in AIADMK. In the General Council, only members are allowed and not even special guests are invited," she said.
Sasikala Puspha could not be reached for comments.
Meanwhile, Anandraj said he has sent his resignation letter.
"I don't have any personal enmity with anyone. I was not invited for tomorrow's General Council. Let anybody be elected as General Secretary. I have sent my resignation letter, hope they accept it," he told reporters.