Mao Zedong, 'BOMBARD THE HEADQUARTERS - My Big-character Poster', cited in Peking Review Vol. 33, 11 August 1967: 5 (https://www.marxists.org/subject/china/peking-review/1967/PR1967-33.pdf, last accessed 4 July 2019).
‘China’s first Marxist Leninist big-character poster and Commentator’s article on it in Renmin Ribao (People’s Daily) are indeed superbly written! Comrades, please read them again. But in the last fifty days or so some leading comrades from the central down to the local levels have acted in a diametrically opposite way. Adopting the reactionary stand of the bourgeoise, they have enforced a bourgeois dictatorship and struck down the surging movement of the great cultural revolution of the proletariat. They have stood facts on their head and juggled black and white, encircled and suppressed revolutionaries, stifled opinions differing from their own, imposed a white terror, and felt very pleased with themselves. They have puffed up the arrogance of the bourgeoisie and deflated the morale of the proletariat. How poisonous! Viewed in connection with the Right deviation in 1962 and the wrong tendency of 1964 which was "Left" in form but Right in essence, shouldn’t this make one wide awake?’