History

Quoting Shelley Baranowski’s Nazi Empire: German Colonialism and Imperialism from Bismarck to Hitler, pages 24–5:

Despite winning seats in the Reichstag in the 1890s, single-issue antisemitic parties did not survive because of conflicts among them.³³ Yet the political utility of antisemitism became irresistible to the major political parties as they sought to broaden their mass support.

If the “rowdy,” demagogic antisemitism of populists such as Böckel and Ahlwardt lost organizational cohesion, the Center, National Liberals, and especially the Conservatives, whose platform of 1892 called for rolling back the civil rights of Jews, appealed to the populist anti-Jewish feeling of peasants, artisans, and small shopkeepers, for whom the Jew personified a[n] increasingly concentrated industrial economy that disadvantaged them.³⁴

The adoption of antisemitism by political leaderships and the huge rural pressure group affiliated with the Conservative Party, the Agrarian League, contributed to a broader trend that characterized Imperial Germany after the 1880s, that is, its acceptability to the social and intellectual élite.

Grant T. Harward’s Romania's Holy War: Soldiers, Motivation, and the Holocaust, chapter 1:

Romanian politicians used antisemitic anxieties to woo the middle class. Romania’s 1866 constitution enfranchised large landholders, the middle class, and well-off peasants who owned property. The Conservative Party garnered support from large landowners (who wielded outsize electoral power), while the Liberal Party appealed to the middle class and well-off peasants. A Liberal government provided the venue for the Romanian-European Antisemite Congress in 1886, and politicians or civil servants made up most of the Antisemite Alliance formed in 1895.⁶¹

[…]

Liberals courting peasant voters, who now made up most of the electorate, blamed social, economic, and political problems on Jews to divert anger away from the party’s failure to deliver on promises of a better life in Greater Romania.⁷³

Grzegorz Rossoliński-Liebe’s Stepan Bandera: The Life and Afterlife of a Ukrainian Nationalist, pg. 81:

Of the Ukrainians living in the Second [Polish] Republic, it was not only Ukrainian nationalists who were obsessed with “Jewish Bolshevism.” This antisemitic stereotype was also widespread among the so-called Ukrainian democratic parties. The UNDO [Ukrainian National Democratic Alliance] claimed in autumn 1936 that “Jews are the most faithful and almost sole propagators of communism.” While antisemitism was thriving in the 1930s, western Ukrainians denied their antisemitism and made fun of the fact that others perceived them as antisemites (Fig. 1).

(The UNDO was supposed to be the moderate alternative to Ukrainian ultranationalism.)

This ultimate instance comes from an article by Jonathan Schneer titled How Anti-Semitism Helped Create Israel. I have saved the ‘best’ for last:

As for the British government itself, philo- and anti-Semitism mixed uneasily in the minds of its principal members, most importantly Prime Minister David Lloyd George and Foreign Secretary Balfour. Lloyd George, who had been raised among devout Welshmen, once remarked during the war that he was more familiar with the geography of Palestine than that of Scotland and that the battles there interested him far more than the battles in France and Belgium. Yet this Christian Zionist, as scholars have sometimes termed him, once described his colleague Herbert Samuel as “a greedy, ambitious and grasping Jew with all the worst characteristics of his race.”

Balfour also operated under similarly conflicting stereotypes regarding Jews. He had been moved to tears by British Zionist leader Chaim Weizmann’s recital of the ills done to the Jewish people. Nevertheless, he told Weizmann that he shared the “anti-Semitic postulates” of the virulent Cosima Wagner, who would become one of the first patrons of Adolf Hitler. Balfour apparently did not believe that Jews could be assimilated into Gentile British society.

(Emphasis added in all cases.)

Naturally, Herzlians only continue to consecrate Bloody Balfour despite the antisemitic filth that came out of his mouth.