Training modules/Dealing with online harassment/slides/cross-wiki-blocking-and-tracking/en

Immediate action: Cross-wiki blocking and tracking
In the event that an obvious harasser is abusing someone across multiple wikis, it may be necessary to take global action. It is possible to globally lock accounts, though only Stewards have this ability. They can also globally block the underlying IP address to prevent the creation of alternate accounts (known as "sockpuppets") or "sleeper" accounts.

CVT are users with administrator rights on most wikis. They can also help to keep cross-project abuse to a minimum. They can also help support projects without administrators, or with very few. However, the role of combatting global abuse is generally best left to the stewards.

CVT can help to track and prevent obvious vandalism or harassment through their own methods. They might be worth contacting to help keep track of harassment on smaller wikis and may have background knowledge of problem users on those projects.