On October 21–23, 1956, a delegation composed of 40 writers and artists discussed the questions of intellectual freedom with such prominent party cadres as Trường Chinh, Xuân Thủy, and Tố Hữu. Of the intellectuals present, the young poet Lê Đạt expressed particularly sharp criticism of the regime's intolerant cultural policies in general, and of To Huu and Hoai Thanh in particular. Among others, he condemned the imprisonment of the poet Trần Dần, and the harassment to which Văn Cao, a famous poet and composer, had been subjected. On the second day, it was the artists' turn to speak. On the third day, Truong Chinh declared that the intellectuals' complaints were justified, but he instructed the participants not to publish anything about the debate in the press. The Hungarian revolution of October 23 (and particularly the Soviet invasion of November 4) put an end to North Vietnam's short-lived intellectual "thaw". The editors of "Nhan Van" intended to publish a special issue about the Hungarian events, whereupon the authorities banned the paper, and adopted a tougher attitude toward intellectual dissidence.