Well, let's break this down into slightly more abstract, essential elements and questions:
Users Foo and Baz are in a dispute. Baz edits from work, sometimes. Foo realizes this, and says they're going to contact Baz's employer to inform them of this workplace policy violation.
Is this a problem?
Does it matter if Foo and Baz work for the same employer?
Does it matter if that employer is a government agency?
-Luna