Which foreigners should not or cannot leave the United States at will?

As we all know, it is difficult to enter the United States. I never know that some people should not leave the United States or it is difficult to leave the United States. It is difficult because it is difficult to re-enter the United States. Some people can leave the United States at will, but once they leave the United States, they may never come back, or it is "possible" to come back after many years. Therefore, before leaving the United States, we should consider relevant factors and make necessary preparations. 1. Foreigners should not leave the United States at will: 1. People who have been convicted or sentenced in the United States may have problems when they leave the United States even if they have a green card. 2。 You have a record of illegal employment in the United States, or your identity was interrupted or your identity was "hacked" for some time. At present, you have submitted I-485 to adjust your status, but you have not yet obtained re-entry permit. You shouldn't leave America. 3。 If you enter the United States with a valid visa and then fail to return, you should marry an American citizen and submit a green card application. You should not leave the United States until you get a green card in the United States (even if you have a return paper). 4。 If you stay in the United States illegally for more than 6 months, you cannot return to the United States within 3 years after leaving the United States; If you stay in the United States illegally for more than 1 year, you may not return to the United States legally within ten years after leaving the United States. Therefore, people who plan to return to the United States after temporarily leaving the United States should consult their lawyers before planning to leave the United States. 5。 The international students of F- 1 also submitted their applications for H- 1B during the OPT internship, but OPT expired before the effective date of H-1B. If an international student leaves the United States at this time, even if the student visa stamp is still valid, the student cannot return to the United States with the original visa. Students must apply for an H- 1B visa (stamped) at the local American consulate, and then return to the United States with the H- 1B visa when it will take effect soon. Second, foreigners should not leave the United States casually: someone asked, Mr. Xie, I don't want to come back after leaving the United States. Can't America leave me alone? ! Yes, it's possible. Because American law authorizes the customs immigration officer to prohibit some foreigners from leaving the country when he thinks that the departure of foreigners is not conducive to American interests. Under what circumstances is it harmful to American interests? 1。 Holding information about US national defense and security that may be disclosed to unauthorized third parties; These data include related plans, schemes, equipment, facilities and buildings. 2。 Deliberately leaving the United States in order to engage in or may engage in any activities to prevent, disrupt, delay or undermine measures and plans taken by the United States or the United Nations to effectively protect any other country; 3。 Deliberately leaving the United States in order to engage in or may engage in any activities to prevent, disrupt, delay or destroy cooperation projects with any other country, so as to jointly protect the peace and security of the United States and other countries; 4。 Deliberately organizing, directing or participating in any rebellion or riot activities against the United States and its allies after leaving the United States; 5。 Military service registration or military training should be conducted, but the registered registration certificate cannot be produced; 6。 A fugitive who committed a punishable crime in the United States, even if his crime occurred abroad; 7。 Witnesses or parties to criminal cases being investigated and tried by American courts are not allowed to leave the country unless they get permission from the procuratorial organs; 8。 Foreigners who are required by activities under investigation or to be investigated by American government agencies, judicial organs or legislatures are not allowed to leave the country; These government agencies include federal, state and local government agencies. 9。 Foreigners with technical or scientific training and knowledge may be used by enemies or potential enemies of the United States to undermine and defeat the military and national defense activities of the United States, or to undermine the military and national defense activities of allies with the same interests as the United States, and are not allowed to leave the country; This clause is terrible when the foreigner's country of nationality becomes hostile to the United States (war) 10。 Any other foreigner suspected of leaving the United States involuntarily shall not leave the United States unless he leaves the United States in the order of extradition or deportation; 1 1。 It does not belong to any of the above situations, but customs officials believe that it is possible that foreigners leave the country and involve some kind of situation that harms the interests of the United States. This provision is extremely general, and the U.S. government gives broad powers to border law enforcement officers to prohibit foreigners who do not want to leave the country from leaving the United States.