In “Protocols of Zion,” documentary filmmaker Marc Levin begins his elusive search for the cause of persistent anti-Semitism by asking: Why do millions of people around the world blame “the Jews” for Sept. 11?

Inspired by a New York City cabbie of Egyptian decent who told Levin that no Jews died in the World Trade Center attacks, our director seeks and finds corroboration on the street from black nationalists and angry young conspiracy theorists who claim that 4,000 Jews didn’t show up to work at the towers that day. (That number, says Anti-Defamation League leader Abe Foxman in the film, originates with an Israeli diplomat who, after the attacks, told a reporter that his office received 4,000 phone calls from worried Israelis.) Full story.