The crime branch of Delhi Police booked Dinakaran for allegedly trying to bribe an Election Commission official to get the 'two leaves' poll symbol in the by-election to the R K Nagar Assembly seat.
He was booked following the arrest of Sukesh Chandrasekhar, a middleman, from a five-star hotel in Delhi yesterday.
The leader of the V K Sasikala faction of the ruling party also claimed he did not know Sukesh Chandrasekhar, a middleman arrested by the Delhi police in this matter.
He claimed efforts were on to "destroy our organisation politically," but said he was not aware who was doing so.
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"Such information is being spread to destroy our organisation politically. It is basically wrong to say that Sukesh has spoken to me. I don't know any such person. I don't know what is the plan and who is doing it," Dinakaran, on his way to meet his aunt and jailed party chief Sasikala at Bengaluru, said.
The Election Commission had frozen AIADMK's 'two leaves' symbol after the two factions led by Sasikala and former chief minister O Panneerselvam staked claim to it.
The bypoll to the R K Nagar Assembly constituency in Tamil Nadu was scheduled for April 12, but the EC cancelled it, saying the electoral process had been "seriously vitiated" by parties through use of money power.
Dinakaran was the candidate of the Sasikala faction.
The seat fell vacant after the death of then chief minister J Jayalalithaa on December 5.