Prime minister calls for calm after clashes in an Athens suburb . Leftist protesters clash with police after the death of a popular anti - fascist activist . A nationalist Golden Dawn party supporter is accused of killing leftist activist George Costa . Opposition leaders renew calls to ban the party , which has grown in influence .
Prime minister calls for calm after clashes in an Athens suburb . Leftist protesters clashed with police after the death of a popular anti-fascist figure . A nationalist Golden Dawn party supporter is accused of killing leftist activist Pavlos Fyssas . Government leaders renew calls to ban the party , which has grown in influence .