New York Mayor Bill de Blasio has presided over a stunning spike in anti-Semitic hate crimes in a city that has been at the heart of the American Jewish experience since the first big waves of Jews immigrated to the United States in the 19th century. The city has long been a place where Jewish culture has thrived and where Jews of all levels of observance could openly and safely worship. Yet between 2017 and 2019, complaints of hate crimes targeting Jews rose by 52%, according to police data, reaching a modern record of 229 as last year came to a close with a flurry of attacks. The incidents have taken many forms, ranging from verbal harassment to brutal beatings. As violence rose and community leaders raised alarms in 2019, New York’s proudly progressive and “woke” leader ignored the problem until he no longer could, at which point he misrepresented it. When pressed on surging anti-Semitic violence last June, de Blasio had a convenient explanation: “I think the ideological movement that is anti-Semitic is the right-wing movement.” Dismissing a reporter who asked him about the global spread of anti-Semitism from the Left, he reiterated, “I want to be very, very clear, the violent threat, the threat that is ideological is very much from the Right.” De Blasio’s statement was so stunningly wrong that it was even contradicted by police officials at the time. As the...