(All photos: Getty Images) Police arrested the leader of Greece's extreme-right Golden Dawn party and other top members on Saturday, in an escalation of a government crackdown after a fatal stabbing allegedly committed by a supporter. It is the first time since 1974 that sitting members of Parliament have been arrested. The arrests underline the Greek government's efforts to stifle the fiercely anti-immigrant party, which has been increasingly on the defensive since the killing. Police announced the arrests of 17 Golden Dawn members on charges of forming a criminal organization, including party head Nikos Michaloliakos, the group's spokesman and three other lawmakers. Of the six lawmakers targeted, only one remains at large.