Rai, who unsuccessfully contested on a BSP ticket from the Ballia Sadar seat, said he has sent his resignation to the party leadership.
He said the BSP did not give importance to his suggestions. "I was feeling suffocated in the BSP... There is a ban on agitations in the party... We are the people who have worked with Janeshwar Misra and Mulayam Singh Yadav."
Rai, considered close to SP leader Shivpal Yadav, was sacked by then chief minister Akhilesh Yadav from his ministry and sidelined in the party.
He had joined the BSP in January this year.
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