I assume by your flip heading that you are absolutely confident that no American radical group would do something like this. I hope you're right.

Well... what I actually had in mind was: "Duh - if American citizens were caught committing genuine treason (as opposed to the Ann-Coulter-foaming-at-the-mouth variety), then yes, it would be 'ok to call it treason'."

I would like to be confident that no Americans would do that; there's no accounting for extremism. I am absolutely confident that something as public as those Germans are trying wouldn't last 24 hours, once word got out.

About legal precedent, in a theoretical sort of way: That collection of essays on treason law I linked to is no newer than 1970, and I'm wondering if a distinction is made between declared and undeclared wars and enemies - that is, similar to the POW/"enemy combatant" issue.