Tripathi is contesting from Nautanwa in Maharajganj district as an Indepndent while SP had given ticket to Kunwar Kaushal Kishore alias Munna Singh.
"The party is expelling Tripathi, his uncle Shyam Narain Tripahti (former MLA), Sudhir Tripathi, Ajitmani Tripahti and others working against party official candidate," SP spokesman Rajendra Chowdhury said.
The Central Bureau of Investigation (CBI) had last week charged Aman Mani Tripathi, son of four-time UP legislator Amar Mani Tripathi, with murdering his wife, Sara Singh.
Sara's mother, Seema Singh, filed an FIR against Aman Mani and his family members for allegedly murdering her daughter.
Aman Mani was declared as party candidate from Nautanwa when Shivpal Yadav had released SP's list of nominees for UP polls.
However, after power centres changed in the party and Akhilesh took over as its president and released the candidates' list, Aman Mani was denied the ticket.
Disclaimer: No Business Standard Journalist was involved in creation of this content