Conductor Daniel Barenboim at the Berlin. State Opera’s concern in solidarity with Ukraine. Photo: Reuters/Annegret Hilse The celebrated Israeli conductor Daniel Barenboim on Sunday delivered an impassioned speech at a solidarity concert in Berlin for Ukraine, in which he recalled how his family had fled the violent pogroms during the early 20th century. Noting his family origins in Ukraine and Belarus, the 79-year-old Barenboim said that his grandparents had fled the “antisemitic pogroms” carried out by the Black Hundreds — a virulently antisemitic Russian nationalist organization active in the first decades of the 1900s — for a new home in...