Party leader Nikos Michaloliakos and others face charges of forming a criminal gang . The case has been brought by the country's anti-mafia agency against three former ministers - including Mr Papakonstantinou who was prime minister from 2008 to 2012 - as well as two businessmen accused Kassidiaris has denied his party 's involvement in Fyssas ' death .
Party leader Nikos Michaloliakos and others face charges of forming a criminal gang . The arrests are part of a crackdown following the stabbing death of a hip-hop artist . Kassidiaris has denied his party 's involvement in Fyssas ' death .