Should Golden Dawn, Jobbik, the NPD and other such neonazi parties be banned

[I spent the winter writing songs about getting better]

First of all, you can't ban parties just for being "extremist" or distasteful. That's a standard way too arbitrary to be enforceable. It's also quite hypocritical to state that all political speech is protected under law, but that parties can be banned just for political speech. Now if the country doesn't have a protection for political speech, you can set a non-arbitrary standard, but it generally doesn't work. For example just look at Germany which has the toughest anti-Nazi laws in the world, yet the NPD is one of the parties mentioned. All they have to do is not say they are a neo-Nazi party or use the swastika.

Second of all banning parties never works. Can anyone cite an example in history where it did? All it results in whack-a-mole, the banned party just reforms under a different name and we're back we started. Look at how Belgium banned Vlaams Blok and they just came back as Vlaams Belang. Or how Turkey used to ban a Kurdish nationalist party every couple years only to see them reform. Or Thailand after every election. It's not like banning a party will make its members think "Ah dammit, now we can't participate in the political process. Guess we'll quit voting and drop out."

Now if the party actually is basically just a front for a violent criminal organization like Golden Dawn, well then yes the criminal aspect should be cracked down on (and note how most of Golden Dawn's leaders have been arrested). And seeing how extremist parties often tend toward this it often renders the question moot most of the time. But banning parties just for political reasons is something that's never going to be effective.

[I spent the winter writing songs about getting better]

Antonio, can you cite a single instance where banning a party successfully stomped out the movement and didn't just result in the party reforming under a different name, or its supporters going entryist into other parties or resorting to violence?

As Maxwell and Goldwater said, it's not like all the supporters of a banned party are just going to give up and quit voting.