The mob

Shore links the herd that Arendt, Adorno and Horkheimer all invoke to Heidegger's conformist das Man, and sees Arendt pulling that single herd apart into two categories, mob and masses.

Put simply Shore: Arendt, Adorno and Horkheimer all speak of "the herd," which Shore links to Heidegger's conforming "they" ("das Man"). Arendt splits that one herd into two groups: the mob and the masses.

What the Dreyfus affair means for Arendt is neither the framed officer nor the birth of Zionism, but crowds in Paris streets demanding Jewish deaths: mob and masses entering history.

Put simply Arendt: what matters about the Dreyfus affair is not the officer who was framed, nor the start of Zionism, but crowds in Paris shouting for Jewish deaths. That is when the "mob" and the "masses" enter history.

Arendt's mob is the bourgeoisie's shadow: gangsters who resent a society that shuts them out, want to force their way back into it, and share its values minus the hypocrisy.

Put simply Arendt's "mob" is the dark twin of the middle class: gangsters who resent the respectable society that shuts them out, want to force their way back in, and share its values without the hypocrisy.

Arendt describes Nazism as the bourgeoisie allied with the mob, an alliance that managed to draw in the masses, recruiting from the politically indifferent rather than from any elite.

Put simply Arendt: Nazism was an alliance of the middle class and the mob that managed to pull in the masses. It recruited from people who had never cared about politics, not from any elite.

In the text In The Origins of Totalitarianism, Part Three, ch. 10, section II, Arendt writes of "the temporary alliance between the mob and the elite."