An international debate over what should be considered anti-Semitism — centred around a controversial definition that critics say chills legitimate criticism of Israel — has reached the United Nations. Last week, a group of 60 human rights and civil society organizations wrote to the leadership of the UN, urging it not to adopt the International Holocaust Remembrance Association (IHRA) definition of anti-Semitism. They say the IHRA framework “has often been used to wrongly label criticism of Israel as antisemitic, and thus chill and sometimes suppress, non-violent protest, activism and speech critical of Israel and/or Zionism.” Among the letter’s signatories are...