Such a dismal scenario marked by an unsympathetic state government and decimation of the only political force that cared for tribal interests led to the emergence of Tripura Upajati Juba Samiti (TUJS) in June 1967. Keeping party membership exclusively confined to tribals, the TUJS raised four specific demands: Autonomous District Council (ADC) for tribals, extension of innerline regulations in Tripura, introduction of 'Kokborok' (tribal language) as medium of instruction for tribal students in Roman script and restoration of alienated tribal land. In their party conference held at Durgachowdhury para village in Sadar subdivision in 1969 the TUJS raised the demand for setting up district council for tribals on the basis of 6th schedule of the Constitution. Within two years the TUJS also floated a force of armed volunteers under the leadership of the then assistant general secretary Mr. Bijay Kumar Hrangkhawal and under the banner of 'Tripur Sena'. Forced on the defensive by the emergence and rapid growth of TUJS and its brand of virulent ethnic politics the CPI (M) also lent support to the demand for 6th schedule in order to retain its tribal vote bank. The party had initial reservations over the issue because it’s leaders never believed that the Congress-ruled Central government would ever agree to amend the Constitution to extend provisions of 6th schedule in Tripura. However, the TUJS' militant agitations for district council evoked adverse reaction from the non-tribal Bengalis who perceived a threat to their land holdings and other rights. The 'Aamra Bangali', a communal outfit and political arm of the 'Ananda Marg', took advantage of the situation and launched a counter campaign to stall the formation of ADC. The Left Front came to power for the first time in Tripura in January 1978 but the sigificant development was the victory of TUJS candidates in four of the state's sixty assembly constituencies. The movement for and against district council reached a fever pitch as the TUJS leadership declared they would form an ADC of their own unless the state government took step to constitute a district council on the basis of 7th schedule of the Constitution which did not require Constitutional amendment. The cumulative effect of all this, exacerbated by the inexperience of the new government, led to the two successive ethnic riots in Tripura in May 1979 and June 1980. The role of the administration dominated by the non-tribals also evoked criticism. Even though non-tribals suffered much heavier casualties in terms of deaths the role of the administration left a deep a scar on the tribal psyche despite the best possible rehabilitation work implemented by the ruling Left Front government under the leadership of the then Chief Minister Mr. Nripen Chakraborty.