This is not an official ACLU notice; it is a suggestion for what the ACLU should be doing.
“Organized stalking” – also known as “gang stalking” – is a crime in which individuals are subjected to psychological terrorism by corrupt members of law enforcement agencies such as Law Enforcement Intelligence Units (LEIUs), the FBI, intelligence-security contractors, and criminal informants."
https://www.reddit.com/r/Gangstalking/comments/6hu7z2/this_letter_stops_police_gangstalking/