We've seen this before, at the celebration of Obama's victory in 2008, where students unfurled the Soviet flag in celebration. I chalked that up to profound historical ignorance, much like the chic wearing of Che Guevara and Mao t-shirts.

The carrying of the Soviet flag at the Occupy Philadelphia protest, by contrast, more likely was knowing, but still ignorant.

It was an insult to the tens of millions who perished under Stalin and who suffered under communist rule; carrying the flag in Philadelphia, the birthplace of liberty, was particularly ironic.  (Video here, h/t @FormerDeminTX)