The Chinese government is succeeding in broadly censoring what its citizens can read on the Internet, surprising many experts and denting U.S. government hopes that online access would be a quick catalyst for democratic political reform. "The Chinese are successfully developing a market economy at the same time they are continuing to accomplish control over the Internet and the media," said C. Richard D'Amato, chairman of the U.S.-China Economic and Security Review Commission, which monitors and promotes economic progress in China. "The Internet is wildly misunderstood," said Rafal Rohozinski, director of the Advanced Network Research Group at Cambridge, who participated in the study. "It is built around very specific chokepoints" that can be controlled. Chinese authorities perform these tasks largely using U.S. hardware and software. Companies such as Cisco and Google Inc. have been accused of aiding China's censorship by tailoring their products to suit the government's needs. The study did not confirm those allegations, which the companies have denied. Some reports on Chinese censorship also claim that the country has as many as 30,000 "Internet police" dedicated to the task.