New Delhi, Sept 3: Known for his administrative acumen, former Union Home Secretary and Lok Sabha member Raj Kumar Singh, who was inducted on Sunday as Minister for Power, New and Renewable Energy at the Centre, was instrumental in the arrest of BJP leader L K Advani in 1990 in Bihar. The 1975-batch Indian Administrative Service officer, who joined the Bharatiya Jata Party after his retirement in 2013, was the District Magistrate of Samastipur in Bihar when in October 1990, on then Chief Minister Lalu Prasad’s orders, he was tasked with the arrest of Advani.