 He also launched 'Operation Siddhartha' and 'Mafia Trial' to combat the MCC terrorist group and the Coal Mafias of Dhanbad, respectively.Dubey was a member of the Seventh Lok Sabha between 1980–1984 as a representative of the Giridih constituency in Bihar.He was a member of the Rajya Sabha from 3 April 1988 until his death on 20 January 1993.