Australia’s Victoria state – home to Melbourne – passed legislation this week that bans the public display of Nazi symbols such as the swastika. It is the first jurisdiction in the country to enact restrictions on the swastika, which has been appropriated by far-right extremists. The law comes as Australia faces a spike in ideological extremism. A top federal police official told a public broadcaster in October that the number of far-right-linked terrorism investigations had increased by 750 percent in about 18 months, even though religious extremism was still a larger threat. The Australian Security Intelligence Organization, a domestic security...