A DOJ warning says people furthering foreign "goals" through public activity must register, and data-center opponents are the target.

Ken Klippenstein reports a warning that anyone furthering a foreign power's goals through "any public activity," including demonstrations, must notify the government or face "significant civil or criminal sanctions." It follows Trump calling opposition to AI data centers a "SICK conspiracy," and Sen. Tom Cotton's June letter asking DOJ to pursue FARA cases against data-center opponents. A March Gallup poll found 71% of Americans oppose local AI data centers (Klippenstein). Only Klippenstein reports the September warning itself, so treat the document as single-sourced while the surrounding context is well established.