Acronym agents
BATF, FEMA, FBI, HS, NSA, DOI USFWS, DIA, DOT, SS, USDJ and plenty more of government agencies track your stuff wherever you go, personally or electronically. What you say, what you do, what you buy and use and what you are hoarding. They leave little messages like those "visitor" names.
I have a list and am prepared for widespread civil disorder! 10 ga