Also worth remembering that the German State in the early 1920's was being propped up by Social Democrats and other figures nominally on the left, who more than once turned a blind eye to the actions of the freikorp when they attacked their left-wing rivals.
On the topic of Greece and Golden Dawn, I can't see them ever winning power democratically, but that's probably not what they're aiming for. If the pro-austerity parties in greece manage to cobble together a government of some kind, and avoid the need for fresh elections that could see Syriza take power, it will be in a very weak position trying to push through further austerity measure. If that government goes on to fall, and the prospect of a new round of elections and a Syriza government becomes likely, I wouldn't be surprised to see a military coup take place. If the pro-memorandum government breaks down the pressure from the EU for someone or something step in and restore order will be very great, and that's probably where Golden Dawn could play a role. They already have street gangs roaming through major cities, they have sympathisers in the armed forces and police, and the presense they have in parliament is just a way to give them some political weight should all this take place. If there's a coup Golden Dawn could end up being the paramilitary wing of it, attacking the left and doing the other dirty work and so on.
