sentences:  Not all works by authors who lived through the Cultural Revolution can be classified as scar literature.Zhang Chengzhi in particular is notable for his idealism regarding his experiences during the Cultural Revolution; his works such as "Black Steed" and "Rivers of the North" have been described as rebuttals to the "negativism of scar literature".However, scar literature did not entirely receive a free pass from the Party establishment; due to its criticisms of the Communist Party and of Mao himself, as well as its exposure of social problems, it came under attack by conservatives as early as 1979.