The elites in Greece are perhaps now discovering something I've been pushing for quite a while:
If you call everyone who wants to preserve demographic and cultural hegemony in their own country Nazis, don't be too terribly surprised when something awfully close to Nazis pops up as a real viable party. Also, if you let the antifa streetfight with them with impunity, don't be surprised if they get good at defending themselves. And don't be surprised if they adopt some of the snazzy trappings of the Third Reich.
They probably don't want to avenge their humiliation in WWI by the French at Versailles. They probably also don't want to claim lebensraum in the Soviet Union and exterminate lots of Slavs either.
Honestly speaking, most governments today have the fascist negatives without any of the fascist positives. I mean---lots of 'invade the world'...lots of 'in hock to the world', plenty of crony capitalism and socialized losses with privatized gains. Lots of socialism with transfer payments and the like. Plenty of pious environmental rhetoric. Only the scapegoats have changed really (some scapegoats, like 'Speculators' seem eternal, regardless of who is doing the scapegoating).
I suspect that I'd hate the Golden Dawn less than most of the other Greek parties. They're even calling for what amounts to Operation Wetback (how would that translate into Greek, anyway?).