dak on LGF posted an excellent point...there's much more to this story than the SF Chronicle and the photographs. How many more people from the Socialist Republic of Vietnam were at the rally? Were they Americans who had been recruited or people who came here from said country? Where did the funding come from for the T-shirts, masks, etc. (is the government of Vietnam funnelling funds to these groups)? From where do they get their marching orders? With what other groups are they affiliated? How exactly are they networked? Methinks we are only staring at the tip of a much larger iceberg here.
I've wondered about those same things myself, we have a anti-American insurgency in this country and I suspect these groups will have some sort of tie-ins to communist/Islamist/dictatorships across the world.