China is reversing the commonly held vision of technology as a great democratizer, bringing people more freedom and connecting them to the world. In China, it has brought control. Cameras scan train stations for China's most wanted. Billboard-size displays ... list the names of people who don't pay their debts. Facial recognition scanners guard the entrances to housing complexes. Already, China has an estimated 200 million surveillance cameras. Such efforts supplement other systems that track internet use and communications, hotel stays, train and plane trips and even car travel. Invasive mass-surveillance software has been set up in the west to track members of the Uighur Muslim minority and map their relations with friends and family. [At] the intersection south of Changhong Bridge in the city of Xiangyang ... police put up cameras linked to facial recognition technology and a big, outdoor screen. Photos of lawbreakers were displayed alongside their names and government I.D. numbers. China's surveillance companies are also looking to test the appetite for high-tech surveillance abroad. At home, China is preparing its people for next-level surveillance technology. A recent state-media propaganda film called Amazing China" showed off a ... virtual map that provided police with records of utility use. "If there are anomalies, the system sends an alert," a narrator says, as Chinese police officers pay a visit to an apartment with a record of erratic utility use.