Dhinakaran was arrested last night following four days of questioning for allegedly attempting to bribe an unidentified Election Commission official to get the undivided AIADMK's 'two leaves' election symbol for his faction.
His close associate Mallikarjuna was also arrested.
Police had earlier said that Sukesh had struck a deal for Rs 50 crore for helping the AIADMK faction to keep the 'two leaves' symbol. Police recovered Rs 1.30 crore in cash from Sukesh when he was arrested from a five-star hotel in Delhi.
Mallikarjuna has been arrested for assisting Dhinakaran for transfer of this money from Chennai to Delhi, he added.
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Police were verifying whether Sukesh had approached any Election Commission official for getting a favourable verdict for Dhinakaran's faction.
The leader had come under the scanner following Sukesh's arrest from a five-star hotel here on April 16.
Dhinakaran, who was appointed deputy general secretary by AIADMK chief V S Sasikala, has been isolated in his party amid moves to merge rival factions led by Tamil Nadu Chief Minister E K Palaniswami and his predecessor O Panneerselvam.
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