A leading supporter of the pogrom was Arthur Griffith, who in 1900 had founded Cumann na nGaedheal, which in 1907 became Sinn Fein, the first and last of the twentieth century's racist-nationalist-fascist movements. Griffith was a strong anti-Semite: he wrote in 1899 that Jews, Freemasons, and pirates were the "three evil influences" of the nineteenth century and that Jews "detested soap and water."
That's the nearest both in content and date I could find to the claim that Sinn Fein organised a pogram against some Jews in the 1930's (Pied Piper)
In Germany, any back-to-the-old-Gods or Pagan or Up-the-Kelten movement would be very attractive for all neonazis.