I’d have to say that Free Republic busting Dan Rather for pushing forged National Guard docs would qualify as a quality civilian counter-propaganda exercise.
...But it’s much more problematic for civilians to go busting traitors like Valerie Plame and her paramour Joe Wilson for their fabricated Niger uranium operation...since civies don’t have access to the right data.
“Busting traitors” would be outside the lane of civilian volunteer counter propagandists, but convincing fellow citizens that treason should be punished wouldn’t be.