The Red Guard movement originated in the Tsinghua University Affiliated High School, a secondary school for faculty and staff of the university, as well as others aspiring to attend the elite university, including the sons and daughters of high-ranking cadres. Song Bailin was a senior high school student at Tsinghua High School, one of the founders and a core member of the Red Guards.
Song kept a diary during the first years of the Cultural Revolution. Yu Ruxin, a researcher of the Cultural Revolution, felt that a section of Song Berlin's diary involving the Red Guards of Tsinghua High School was of historical value. Yu decided to publish the diary in its entirety as it was, with no deletion except for the correction of obvious typos. The diary covers the period from May 1966 to February 1968, the launching phase of the Cultural Revolution. A selection of diary entries from January to April 1966 has been included to give a better understanding of the political climate in China on the eve of the Cultural Revolution as well as the ideological trends of high school students.
Because the diary is a historic document directly from an era that is now more than half a century old, the diary lacks historical background and footnotes that might help current readers understand the context of that time. Fortunately, the current publication has a preface written by Luo Xiaohai, who explains the political atmosphere in the years leading up to the Cultural Revolution and some of the key events of that time.
For readers today, the diaries are at times hard to decipher. The Red Guards quickly were criticized by others, including those in power. As the writer Hu Ping notes
in a 2007 review of the book, the reversal of support for the Red Guards must have caused confusion and even a sense of betrayal by many involved. The diary, however, reveals none of this inner turmoil, Hu Ping ascribes the Red Guards' silence to the fact that keeping a diary in that era was a way for participants to prove their revolutionary zeal. Thus they self-censored and wrote with the expectation that their words would be discovered and could be used against them. This means the diary provides little in the way of psychological insights in the Red Guards.
It does, however, provide a way of understanding how totalitarian terror and power works on individual psychology. Thus when his classmates beat classmates and teachers, Song expressed embarrassment that he lacked their fervor and did not participate. This means that the diary is best seen as a primary document that shows the way young people thought at that time, rather than an exercise in self-reflection or criticism.