If somebody's personal information has been leaked, go here and provide basic information and the urls (the writing at the top: for example, on this page it is https://en.wikipedia.orgview_html.php?sq=Battle of Bucha &lang=en&q=User_talk:Rubbish_computer)
If you've experienced threats (not including "If you continue to vandalize Wikipedia, you may be blocked from editing") or harassment, going here may be required.