was the notification in writing. I would write or email (something where you have a record of your communication) and state that you would like the school to give you all of the reasons and facts behind this decision in writing. While you wait for that try to connect with the teacher and also find out what is going on with your son. Also, start reading every district policy (and state statutes) that relate to gifted education - and also on discipline and the routes to challenge disciplinary actions (these are unlikely to be gifted specific). I would start there, and I would try to get the principal's response within 10 days or so.

keep us posted. Cat