"We will seek feedback from all the candidates to the party district presidents to find out who all are engaged in the anti-party activities. Those found to be involved in the wrong doings, action will be taken against them. Nobody will be spared," Yadav told reporters outside the Parliament.
The SP had formed an alliance with the Congress in the Uttar Pradesh assembly polls, but both parties managed to win only 54 out of 403 seats.
The BSP got 19 seats, while the BJP and its allies notched up 325 seats.