Historians of American Communism, a scholarly historical organization established in 1982.
The four monks mentioned are Mo Luo Qi Yu (Ma Ha Kỳ Vực) Kang Senghui (Khương Tăng Hội), Zhi Jiang Liang (Chi Cương Lương), and Mou Bo (Mâu Bác, i.e. :vi:Mâu Tử) author of the Mouzi Lihuolun (Lý Hoặc Luận).