During the ``Cultural Revolution'', the Gang of Four slandered the intellectuals as the ``stinking Number Nine'' -- the ninth category after landlords, rich peasants, counter-revolutionaries, bad elements, Rightists, renegades, enemy agents and ``capitalist roaders''. In his talk of May 3, 1975, with members of the Political Bureau who were then in Beijing, Mao Zedong quoted from an actor's line in the Beijing Opera Taking Tiger Mountain by Strategy: ``We can't do without Number Nine.'' He used this quotation to criticize the Gang of Four's slander against the intellectuals and to indicate that the cause of revolution and construction requires the services of intellectuals. pp.