Kassidiaris was serving a 13-year sentence as a senior figure in the criminal organisation, linked for years to attacks on migrants and political opponents and to the 2013 murder of anti-fascist rapper Pavlos Fyssas.
Kassidiaris was serving a 13-year sentence as a senior figure in the criminal organisation, linked for years to attacks on migrants and political opponents and to the 2013 murder of anti-fascist rapper Pavlos Fyssas.