Dear [Name] or [Sir or Madam of unknown],
Please be advised that I condemn your actions of [Date] when you [Describe what they did].
It has [describe the damage it has caused].
It is my hope that you will reconsider and rectify the damage.
Very Truly Yours,
[Your name]
Another Example:
http://www.ibiblio.org/obl/reg.burma/archives/199701/msg00262.html
Don't send unsigned letters. Anything you can't put your name on shouldn't be sent.
Answered Oct 21, 2011
Edited Oct 21, 2011