Ms. Hefrin Khalaf, Secretary General of the Future Syria Party, was executed by Free Syria Army mercenaries under Turkey's control on October 12. The international community, led by the United States, must not countenance atrocities committed with impunity. It should prevent Turkey from renewing its attack against the Syrian Kurds, as Erdogan threatened. Intervention would save civilians and create conditions conducive to internationally mediated talks on the status of northern Syria.