Do they belong to an organization with the stated goals of global conquest, genocide, and enslavement? Does they belong to an organization with standing declarations of war against us or allies?
Not so hard. Of course it excludes slimes almost exclusively, and rightfully so.
I would disagree that it would be easy enough, but it can be done as long as we can accept that we may have to throw out the good with the bad, which I am fully in support of, as much as I don’t like it.
If they belong to an organization with the stated goals of global conquest, genocide, enslavement, and/or standing declarations of war against us or allies, that makes it easy if we have a way to prove that, but the reality is, we probably won’t.
But I believe it is our right to deny entry regardless.