His grandfather, Bajrang Bahadur Singh, served as the first vice-chancellor of Pant Nagar Agriculture University and subsequently as the second Lieutenant Governor of Himachal Pradesh state.
[4][14] In 2005, he became the minister for Food and Civil Supplies, and despite his pending criminal cases, he came to be assigned the highest level of security (Z-category) provided by the state,[15] though the threats against him were not specified.
In 2018, he voted for the Bharatiya Janta Party in the Rajya Sabha polls against the BSP candidate Bhimrao Ambedkar.
[18][19] In 2002, on an FIR filed by a dissident Bharatiya Janata Party (BJP) MLA Puran Singh Bundela of alleged kidnapping and threatening with dire consequences, got Raghuraj arrested on the orders of then Chief Minister Mayawati at the early hours about 4:00 A.M. of 2 November 2002.
[22] Within 25 minutes[23] of the Mulayam Singh Yadav's government coming to power in 2003, all POTA charges against him were dropped.
[27] On 3 March 2013, Deputy Superintendent of Police (DSP) Zia Ul Haq was killed in Kunda, a constituency represented by Raghuraj Pratap Singh, during clashes that followed the shooting of the village head, Nanhe Lal Yadav.
Following a complaint by the deceased officer's wife, Parveen Azad, a case was initiated against Raghuraj for his alleged involvement.
The FIR identified Gulshan Yadav, the chairman of Kunda Nagar Panchayat, Harion Srivastava, a representative of Raja Bhaiya, Guddu Singh, Raja Bhaiya's driver, and two other villagers, Kamta Prasad Pal and Rajesh Kumar Pal, as primary suspects.
[33] CBI which was probing the killing of DSP Zia Ul Haq gave him a clean chit in 2013.
It was alleged that wheat & rice were diverged from Public Distribution System and even exported when he was minister of food & civil supplies.