CHENGDU (AFP).- A group of museums commemorating China's violent Cultural Revolution is opening up normally tightly controlled discussion of the chaotic era -- but only up to a point. Businessman Fan Jianchuan has opened six museums about the ten year period beginning in 1966 when China's then-leader Mao Zedong called on ordinary citizens to struggle against entrenched interest groups -- including government officials. The 55-year-old says he's filled six warehouses with artefacts from the period, when young people formed often violent "Red Guard" groups and those labelled as "capitalist roaders" were publicly tortured at mass rallies. "I see myself as an archaeologist of the Cultural Revolution," Fan, a former government official who made a fortune as a real estate developer, told AFP in his museum office in the southwestern city of Chengdu.