District unit secretaries P Vetrivel, N G Parthiban, M Rengasamy and Thangatamilselvan, all considered close to Dhinakaran, were being "relieved" from their posts, said chief minister K Palaniswami, who is also AIADMK co-coordinator, and deputy chief minister and party coordinator O Panneerselvam.
Vetrivel is district secretary, Chennai (North), while Parthiban is the secretary of Vellore (East). Rengasamy is the secretary of Thanjavur (North) and Thangatamilselvan of Theni.
Five other functionaries were being removed from the party, they said in a joint statement.
Among them were V P Kalairajan and V Muthiah, district secretaries of South Chennai (North) and Tirunelveli Urban, respectively. Va Pugazhenthi, secretary of AIADMK's Karnataka unit, and spokespersons Nanchil Sampath and C R Saraswathi had also been removed from the party, they said.
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Panneerselvam and Palaniswami said the five were being "removed" since they went against the party's principles and brought "disrepute" to the AIADMK.
"Party workers are requested not to have any truck with them," they said in the statement.
The action comes a day after Dhinakaran won the R K Nagar bypoll by a thumping margin of 40,707 votes against AIADMK's E Madhusudhanan.