Occurrence in Ukraine: When the Whites or Greens captured towns and cities in Ukraine with large Jewish populations, it often led to pogroms.
Traditional Anti-Semitism: Prevalent among the city lumpen proletariat and peasants.
High Percentage of Jews in Communist Elite: Fueled resentment against Jews, even though many Socialist Revolutionaries and Mensheviks were also of Jewish origin. thus harden gain support non communist jews