The troll set up a phone number for people to report crimes committed by unauthorized immigrants. The system is entirely useless for curbing crimes or catching criminals. Its sole purpose is to spread, by existing, the impression that they commit a lot of crimes.

People immediately began reporting supposed crimes by aliens of another sort, flying in UFOs.

In general, the victims and witnesses can't tell whether the person who committed the crime is an unauthorized immigrant, unless they know that person. However, Serious investigation says they commit fewer crimes on average than US citizens.