"Yet K.S. Lal maintains that for several decades the Left-liberals in the history establishment have discriminated against people of differing views. "The ICHR was not politicised by the BJP but by the Marxists. Nurul Hasan, and Irfan Habib after him, packed the place with Leftists," Lal says, citing instructions by the NCERT in 1982 to "weed out undesirable textbooks in history" and the notification by the West Bengal Board of Secondary Education, which in 1989 said "Muslim rule should never attract any criticism. Destruction of temples by Muslim rulers and invaders should not be mentioned." As far as he's concerned, says K.S. Lal, this is an attempt to suppress facts. He also says the Congress has always promoted its brand of official history through agencies like the NCERT."