The Council on American-Islamic Relations (CAIR) presents itself as an innocuous Muslim civil rights group—a reputation it reinforces with litigation and claims of anti-Muslim bigotry. But the group finds itself under increasing scrutiny for alleged connections to the Muslim Brotherhood and its offshoot, Hamas. Last November, Texas Governor Greg Abbott designated CAIR a terrorist organization. The following month, Florida Governor Ron DeSantis followed suit, citing CAIR’s being listed as an unindicted co-conspirator in a major terrorism financing case. But as other states move to sideline CAIR, California is embracing this alleged terror front. CAIR-CA, the organization’s largest statewide affiliate, is...