The best accounts would be from Sidney Rittenberg, a most excellent gentleman passed away last year in his home in Arizona at the age of 98. He wrote a book called The Man Who Stayed Behind and has done numerous interviews in the English-language press, including this one in The Atlantic from two years ago, as well as this one in Danwei, which is about a documentary called The Revolutionary. There’s an abundance of writings by and about the man if you look for him. We also interviewed him for the Sinica Podcast in 2017.