The FBI’s growing list of domestic threats has mutated in recent years to include every conceivable affiliation of Americans across the political spectrum: right-wing violent extremists, left-wing violent extremists, black identity extremists, and animal rights extremists. The current administration has even added nihilistic violent extremists—those who “believe in nothing”—to the laundry list. The Biden administration, for its part, aided in this exercise by vastly overstating the threat posed by Trump-aligned conservatives in the wake of January 6th. But neither Democratic nor Republican administrations have ever grandstanded about another significant threat group that the FBI secretly monitors on U.S. soil: Israeli...