A term used by
exhausted brave Soviet Union
commanders in deciding which Nazis/right wing POWs would get executed via glorious Soviet firing squad. 'WALL' was used because the condemned would be forced to stand against a wall to avoid bullets going elsewhere.
The commander would simply ignore someone or point at them and yell 'STENA' meaning 'WALL' meaning the POW had been chosen for execution.
In the modern day, the term 'WALL' is used by leftist circles to subtly tell other leftists that the person in question would be executed if they lived in a glorious communist republic. Used online 99.9% of the time. NOT used by liberals/centrists for their known soy intake levels.