For this definition and a review of scholarly definitions see Wilhelm Heitmeyer and John Hagan, International handbook of violence research, Volume 1 (Springer, 2005) pp 352–55 online
"Pogrom"، Encyclopædia Britannica۔ "pogrom، (Russian: "devastation," or "riot")، a mob attack, either approved or condoned by authorities, against the persons and property of a religious, racial, or national minority.