To identify all of them, the Immigration Policy Tracking Project, developed by Lucas Guttentag, has been performing what it calls “public-policy forensics,” that is, searching for new policies in “the Federal Register, legal blogs, government Web sites, Listservs for immigration attorneys, and nonprofit newsletters.” Tracking and overturning all the Trump-era directives, both well-known and hidden, is an essential task that the Biden administration must get behind.