Some changes to Wikipedia pages may be against the law, or may say things that are not true and hurt people. When that happens, the people hurt might send a letter or e-mail to Wikipedia to complain.
The organization that runs Wikipedia may need to change an article to correct the problem. This is done only if the problem is against the law, or against Wikipedia policies on how articles should be written. This is not done if the person complaining only wants a more favorable article or is trying to intimidate.
See this page about office actions on Wikimedia Meta for more information.