I found this definition at thefreedictionary.com

Noun 1. domestic terrorism - terrorism practiced in your own country against your own people; "the 1995 bombing of a federal building in Oklahoma City was an instance of domestic terrorism"
act of terrorism, terrorism, terrorist act - the calculated use of violence (or the threat of violence) against civilians in order to attain goals that are political or religious or ideological in nature; this is done through intimidation or coercion or instilling fear

Sometimes I wonder if most of our politicians aren't guilty of this...