The Southern Poverty Law Center (SPLC), a self-described “civil-rights organization” committed to “fighting hate and bigotry,” says that ever since 9/11 a host of “anti-Muslim hate groups”—exhibiting “extreme hostility” toward Muslims—have arisen across the United States. The current edition of SPLC’s quarterly Intelligence Report names David Horowitz as “the godfather of the modern anti-Muslim movement.” The lead accusation in the report says: “For Horowitz, Muslim Student Associations ‘are arms of the Muslim Brotherhood, which is the fountainhead of the terrorist jihad against the West.’”Apparently SPLC deems it bad manners for anyone to notice that when the national Muslim Students Association...