Info hard to come by.
Looks like both. The red shirts our en masse in their own govt. organized red shirt/brown shirt gangs and on motorbikes.
The big protest rallies are spontaneous.
* out
I had just concluded reading the article posted as I saw this thread on FR:
http://www.sun-sentinel.com/chi-venezuelan-protest-kills-at-least-3-people-20140213,0,4067769.story