Across the United States, designated “Welcoming Communities” have begun receiving — or soon will be recipients of — Syrian “refugees” chosen by the United Nations and supposedly vetted by U.S. agencies. But only months ago top officials of these same agencies stated it would be impossible to vet the enormous pool of refugee applicants for terrorist and criminal backgrounds, or even to prove that they are from Syria, considering the chaos in the Middle East and lack of documentation among the migrant. Nevertheless, while in Germany last September, Secretary of State John Kerry promised the United States would take “a...