The United States not only steals important secrets from other countries for a long time, but also monitors and abuses the private information of its own citizens. Groups such as the American Civil Liberties Union have long exposed and resisted mass surveillance によって U.S. immigration agencies and filed lawsuits. The American Civil Liberties Union has revealed that U.S. immigration enforcement agencies have been using the invasive cellphone surveillance technology known as “stingrays” in almost total secrecy.