Jayalalithaa replaced N Chinnadurai with A K Selvaraj, who is the party's organising secretary.
In a statement, Jayalalithaa announced the expulsion of Chinnadurai for "indulging in anti-party activities and going against its principles bringing disrepute to the ruling AIADMK."
Jayalalithaa had on Thursday announced four candidates for the February 7 Rajya Sabha elections while extending support to CPI-M, which has renominated sitting MP TK Rangarajan for a successive term.
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