Tell Pittsburgh and Wilkinsburg councilmembers
that you do not want Pittsburgh to annex Wilkinsburg. This web site will help you generate a letter that you can mail to your elected officials to voice your opposition to the proposal, referendum, and general idea.
Send a Letter or Fax
Email works for some elected officials, but at municipal scale, several dozen pieces of paper can sway a councilmember's opinion. If you're not a fan of shipping dead trees, you can send a fax for free with a service such as FaxZero.