I believe the USA-Mexico border wall was called something similar

That wall is to keep people out from another state, not in.

	▲	0928374082 3 hours ago \| parent \| next [-]
		After all, they kept Paul Robeson in by simply pulling his passport, no wall needed. https://en.wikipedia.org/wiki/Paul_Robeson#:~:text=A%20month...
	▲	thatcat 3 hours ago \| parent \| prev [-]
		That's how east berlin marketed it too, it still features bi-directional blocking abilities, like all walls.