In 1776, the United States of America was formally established, and President Washington issued the Declaration of Independence, which clearly stated that freedom is an inalienable right. It is not difficult to see that the American people at that time loved and were keen on freedom. Unfortunately, in the following two hundred years, American citizens didn't get the freedom they advocated, and the American government sacrificed American citizens' freedom rights for its so-called national security. Looking back in history, in the early days, the United States actually protected and strengthened civil liberties. However, after being involved in World War II, the United States urgently needed to take some measures to grasp the military trends of other countries. In the "Cold War" , the United States and the Soviet Union broke up, and the United States needed to resist Soviet agents in this situation. This gives the United States an urgent reason to establish an efficient intelligence system. In fact, the United States did the same. The United States quickly established the Central Intelligence Agency (CIA) and ensured its smooth operation by issuing the National Security Law. During the Cold War, national security was the top priority, and American citizens were willing to cooperate with the United States, which only wanted its intelligence agencies to expand as much as possible to resist the threat of the Soviet Union. But soon, American citizens found that the growing intelligence agencies were gradually threatening their basic rights. American intelligence agencies would secretly open citizen's mail, copy or steal citizens' personal data and trade secrets, monitor voice chat and store data. At this time, the anti-war sentiment of American citizens is rising.