My guess, and it’s only a guess, would be Liebel Bergman. I am afraid I cannot check this as my files are in New York and I am currently in Hanoi. But Bergman was an anti CPUSA Communist later affiliated with the Revolutionary Union/Revolutionary Communist Party that was Maoist. He also lived in China during the 1960s. His papers are at the Taimiment Library at NYU.
He was married to Vick Garvin who was also in China during that time.