"Wall Street analysts now follow the growth of companies that install surveillance systems providing Chinese police stations with 24-hour video feeds from nearby Internet cafes. Hedge fund money from the United States has paid for the development of not just better video cameras, but face-recognition software and even newer behavior-recognition software designed to spot the beginnings of a street protest and notify police. Now, the ties between China’s surveillance sector and American capital markets are starting to draw Washington’s attention. [...] Mr. Yap said investment firms from Europe, the United States and Asia were so enthused about the surveillance market in China that he typically led a full-day tour each week to some of the company’s factories and installations."