Reasons why an alien cannot be admitted to the US; 8 USC 1182 Summary of reasons non-US citizens cannot be admitted to the US from 8 USC 1182: The source of these issues is the 1952 "Immigration and Nationality Act of 1952",  aka McCarren-Walter act at  https://www.govinfo.gov/content/pkg/STATUTE-66/pdf/STATUTE-66-Pg163.pdf. This PDF lists it as Public law 414 Chapter 477. In this PDF see chapter 4 "Provisions relating to entry and exclusion". There are already existing laws still on the books, but no one is enforcing them. Source: https://www.minds.com/newsfeed/968110202141745152