A political event hosted by “Broad City” star Ilana Glazer at a historic Brooklyn synagogue was canceled Thursday when a vandal scrawled “Kill all Jews” inside. The NYPD said “anti-Semitic messages” were discovered on the stairwell of Union Temple in Brooklyn Heights around 8 p.m. Thursday. At about 8:30, Glazer came out of the venue to tell the crowds that the 8 p.m. event, in which she was scheduled to interview journalist Amy Goodman and New York state Senate candidates Andrew Gounardes and Jim Gaughran, was canceled because of the graffiti. “She didn’t feel comfortable ushering 200 people into the...