The complainant, Nihaluddin, a resident of Kutubpur Thara village, has accused the MLA and his assistant Azhar Siddiqui of allegedly kidnapping his son, Pappu, and extorting Rs 25 lakhs from him, SSP Sunil Saxena said.
Earlier, Nihaluddin had sought the MLA's help for getting his son's name dropped from a "fake case" in 2014 for which he was asked to pay up Rs 25 lakhs towards "party funds". The amount was paid on November 28, the SSP said.
Nilhaluddin was severely beaten up by them when he demanded his money, according to the complaint.
An FIR has been registered and investigation initiated, the officer said.
In August, Abid Raza who was the MLA elected from here was suspended from the Samajwadi Party for anti-party activities.