Vietnam communist? Not really as far as i know. Also all communist states have been dictatorships to some degree, including china.
Best examples today: North Korea, Cuba. Burma's another one (officially titled: Socialist republic of Myanmar), and probably a few that aren't in the news so much that i missed. The world's a big place.
But the best example i know of communism the way it was meant to be, isn't a state but rather some rebel-controlled regions of south America. It's not all bad there.
As for punk, i like the music, and the idea of punk still lives, in other kinds of music. The original punk is an era that is no more. I think it's important to separate punk in it's musical and political elements, as each of these have gone completely separate ways.