Who is Jiang Qing from To the Storm: The Odyssey of a Revolutionary Chinese Woman and what is their importance?

Jiang Qing was the wife of Mao Zedong. She had taken part in a demonstration at Beida in which she verbally attacked the wife of Mao's second son and supported Nie Yuanzi. She had private railcars in which Lao tang traveled as a member of Liang Xaio. She was arrested with the Gang of Four.