Chennai police arrested Thirunavukkarasu, Naresh, and Thiyagarajan following a bribery complaint filed by TVK legislator N Elaiyaraja.
TVK MLA N Elaiyaraja alleged he was offered a Rs 35-crore bribe to vote against Assembly Speaker JCD Prabhakar in a proposed no-confidence motion.
Police investigations linked the accused to V Ashok Kumar, the brother of DMK MLA and former minister V Senthil Balaji.