In general we witness at least one incident of police brutality almost weekly for months now. The frequency has been increased to almost daily lately not to mention passing a law that essentially curtails demonstrations and gives even more authority to police on them. I'm in fact quite surprised that none of these have been covered to almost no extent in international news.
The irony is that all this is coming at a period when Greeks barely demonstrate at all. The vast majority just seems to have accepted their fate, i.e. economic misery ad infinitum, and it's been like that for years now. So, I'm guessing this has to do with a special agenda of the relatively new right-wing govt. Who knows. Fact of the matter is that policemen != protectors.
I believe it is a sign of deep rot of western democracies that police is the most dangerous thing you can happen upon in a number of western "democratic" countries.