Antisemitism has been described as the canary in the coal mine of freedom, and with hateful bigots and dangerous conspiracy theorists now finding willing audiences online, UN Secretary-General António Guterres on Saturday said, "we must pledge to speak out wherever we witness hate and to stand up for human rights and dignity for all." "The Holocaust did not happen as a 'lesson' for humanity, but it did happen. And because it happened, it may happen again," Mr. Guterres told the annual ceremony held at the historic Park East Synagogue in New York to commemorate the liberation of the Auschwitz concentration...