Two terrorists who had pledged allegiance to the Islamic State group gunned down 16 Australian Jews on Sunday. They and 40 others who were wounded were targeted as they memorialized the Jewish holiday of Hanukkah at Sydney’s Bondi Beach.

The correct responses to this attack should be clear. We should emphasize the historic, sadly enduring immorality and absurdity of antisemitism. We should bolster security for Jewish places of worship, education, and events. We should ensure that counterterrorism operations are resourced robustly. A crackdown on free speech is, however, ill-judged.

Both Australia and the United Kingdom are doing just that. Australia will introduce new laws to ban speech, including “serious vilification” of racial or religious groups. U.K. police forces are also now making arrests for those who shout “globalize the intifada” at protests.

We should be grateful that neither of these actions would be constitutional in the United States. First........

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