Earlier quoted context omitted.
Do you have info on the stalking? It is common practice when organizing a union to note the likely strongly anti-union people, to not solicit them, and inform them last of the effort. I say this because I presumed they were just screenshotting the guy's employment photo and name, and posting in the private group, "don't solicit this guy, he might scupper the effort."
Really? It would seem more likely they would try to harass the guy who's anti-union.
I have participated in "get out the vote" operations. In that case it's quite similar: you mostly want to avoid knocking on the door of likely-strong-no households, as you have so many likely-strong-yes doors to knock, and debating people on the doorstep is a waste of precious time when close to an election/primary -- so you can see the value in having a good data operation to know which houses are likely one way or the other, and spreading that knowledge to your canvassers.