Can Chinese who are not naturalized in the United States become civil servants (police, etc.)? ) In America?

Your words are full of contradictions. Since you haven't joined American citizenship, how can there be Chinese? At present, there are only two kinds of legal residents in the United States, one is an American citizen with American citizenship, and the other is an American permanent resident with a green card. In addition, some people hold temporary visas to study and work abroad. Others are illegal immigrants without legal status. What you said about Chinese Americans who have not joined American citizenship does not exist. As long as you are not an American citizen, you can't and can't apply for American civil servants (including police).