Curious about you photo I found this:
Wu’s thesis was that the Cultural Revolution was at first caused by Mao’s direction. He was enamored with the idea of a ‘permanent revolution’ but still clung to the idea of the vanguard state and retaining power. As the movement continued, however, the party soon lost control and public order collapsed.
https://www.goodreads.com/book/show/18770255-the-cultural-revolution-at-the-margins
Looks to be an interesting read.