In his application to the SSP Lucknow, Thakur said he had given the complaint to Inspector of Hazratganj police station Vijay Pal Singh Yadav who initially refused to receive the complaint and has not registered the FIR till date.
He said Mulayam's statements were "definitely criminal intimidation", which is a cognizable offence and hence he has sought FIR.
Thakur alleged that Mulayam had threatened him over phone with dire consequences on July 10.
The Uttar Pradesh government had suspended Thakur on July 13 and appointed the Enquiry Officer on July 14 to complete the enquiry within minimum time, asking him to assist in the enquiry in fullest measure.
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In his petition before the Central Administrative Tribunal (CAT), he challenged the appointment of Chairman, Police Recruitment and Promotion Board VK Gupta as the enquiry officer against him and IG (Personnel) BP Jogdand as the representing officer.
Thakur said that as per Rule 8(6) of the All India Services Discipline and Appeal Rules an Enquiry officer can be appointed only after getting a reply from the officer under Rule 8(5).