According to this definition virtually all police action and certainly all judicial action resulting in confinement is terrorism. While I certainly have some radical colleagues who would support this conclusion, I don't think it suggests a helpful set of analytical boundaries.

I mean, most police action is non-violent and the majority of it is ostensible nonpolitical in that it does not explicitly discriminate by political party, and so is most imprisonment as well. The State Department's stipulation is "...by subnational groups or clandestine agents," FWIW...