>There's a known case a few years ago where a woman was trapped away from the US for 3 years - her estranged husband put her on the list when she went to visit her parents, and boom, she's not allowed into the US and no-one will tell her why, making it easy for him to get divorced and keep the house.
How does one "put her on the list"? It's not that easy.
Apparently if you happen to be working in the right government department then it is. It was only discovered when he applied for a promotion and they did an extended background check.
You can almost certainly get anyone put on this list by simply creating an email account like firstname.lastname@protonmail.com and sending out a few threatening emails to the right places.
How does one "put her on the list"? It's not that easy.