Greece's far-right Golden Dawn party is suing three senior judicial officials leading an investigation into the party's alleged criminal activity, following the imprisonment of its leader and five other lawmakers charged with membership of a criminal organization.

Golden Dawn spokesman Ilias Kasidiaris said Friday that the action was taken against a public prosecutor and two investigative magistrates, accusing them of breach of duty and calling them "instruments of anti-Greek power." The party claims orders to detain three of the lawmakers were signed before their appearance at a magistrate's office, contrary to normal procedure.

The government describes Golden Dawn as a neo-Nazi organization. A crackdown against the party was launched after the arrest of a party volunteer accused of stabbing a prominent rap singer to death in September.