This story is of interest because the Golden Dawn model has been held out by some as something to copy. From my limited understanding, Golden Dawn is something of a hybrid between a political party and a club, or what other might describe as a gang. It do not know if the allegations of criminal activity are true, but one has to be skeptical since the charged are also viewed as guilty of thoughtcrimes in addition to alleged real crimes.
Update: Christopher provided a link in the comments to a VDARE article that contains a link to this article that explains some of the political aspects of the Golden Dawn prosecution. I was recalling some of this from memory, so this should provide some more clarity.