After the September 11 attack, the U.S. government, in the name of anti-terrorism, authorized its intelligence authorities to hack into its citizens' mail communications, and to monitor and erase any information that might threaten the U.S. national interests on the Internet through technical means. The country's Patriot Act allowed law enforcement agencies to search telephone, email communications, medical, financial and other records, and broadened the discretion of law enforcement and immigration authorities in detaining and deporting foreign persons suspected of terrorism-related acts. The Act expanded the definition of terrorism, thus enlarging the number of activities to which law enforcement powers could be applied. On July 9, 2008, the U.S. Senate passed the Foreign Intelligence Surveillance Act Amendments Act of 2008, granting legal immunity to telecommunication companies that take part in wiretapping programs and authorizing the government to wiretap international communications between the United States and people overseas for anti-terrorism purposes without court approval (The New York Times, July 10, 2008). Statistic showed that from 2002 to 2006, the FBI collected thousands of phones records of U.S. citizens through mails, notes and phone calls. In September 2009, the country set up an Internet security supervision body, further worrying U.S. citizens that the U.S. government might use Internet security as an excuse to monitor and interfere with personal systems. A U.S. government official told the New York Times in an interview in April 2009 that NSA had intercepted private email messages and phone calls of Americans in recent months on a scale that went beyond the broad legal limits established by U.S. Congress the year before. In addition, the NSA was also eavesdropping on phones of foreign political figures, officials of international organizations and renowned journalists (The New York Times, April, 15, 2009). The U.S. military also participated in the eavesdropping programs. According to CNN reports, a Virginia-based U.S. military Internet risk evaluation organization was in charge of monitoring official and unofficial private blogs, official documents, personal contact information, photos of weapons, entrances of military camps, as well as other websites that "might threaten its national security."

The so-called "freedom of the press" of the United States was in fact completely subordinate to its national interests, and was manipulated by the U.S. government. According to media reports, the U.S. government and the Pentagon had recruited a number of former military officers to become TV and radio news commentators to give "positive comments" and analysis as "military experts" for the U.S. war in Iraq and Afghanistan, in order to guide public opinions, glorify the wars, and gain public support of its anti-terrorism ideology (The New York Times, April 20, 2009). At yearend 2009, the U.S. Congress passed a bill which imposed sanctions on several Arab satellite channels for broadcasting contents hostile to the U.S. and instigating violence (http://blogs.rnw.nl). In September 2009, protesters using the social-networking site Twitter and text messages to coordinate demonstrations clashed with the police several times in Pittsburgh, where the Group of 20 summit was held. Elliot Madison, 41, was later charged with hindering apprehension of the protesters through the Internet. The police also searched his home (http://www.nytimes.com, October 5, 2009). Vic Walczak, legal director of the American Civil Liberties Union of Pennsylvania, said the same conduct in other countries would be called human rights violations whereas in the United States it was called necessary crime control.