Criminals edit Wikipedia. They include a couple of the mass shooters who have terrorized many Americans recently. They also include others who have committed particularly heinous murders, convicted sex criminals, financial con artists such as insider traders and Ponzi scheme operators. There are also tax-evading billionaires – one awaiting trial, another who has already confessed and is waiting to testify at trial. And then there's those who haven’t officially entered the criminal justice system, such as some of the Russian oligarchs. I’ll call these and similar editors “black hat editors”, just to keep these distinctions clear.
First, though, you should know how I know that criminals edit Wikipedia. To show that The Signpost does not need to identify criminals by their user names or real world names, I won’t name some of the convicted criminals.