I'm actually not so sure that this is a good thing. Without hard evidence that the higher-ups explicitly ordered Killah P rubbed out, I don't think that there are grounds for arrest here (except for the scumbag who actually committed the murder, of course). Also, Golden Dawn have high support amongst Greece's police and military, so an unfavorable verdict for the arrested could lead to extremely bad things in Greece's future. In summary, I hope that Golden Dawn's leaders beat the rap, then get run over by a double-decker bus.