In fact, he was wrong, by. Eighty years after his book was published, I doubt whether a single university department anywhere in the world pays any attention to this subject.
Cole The Intelligent Man's Review of Europe
To-day (1933). Published by Victor Gollancz. A typical book described as left-wing. It has almost nothing on Jews (which in view of the date ought to be remarkable).
[Left] A hefty tome edited by Robert Maxwell, based on The Great Soviet Encyclopaedia (1962). What does it say about Jews and the USSR? No prize offered for the correct guess.
[Right] Ronald W Clark's biography Lenin: The Man Behind the Mask (1988). There is exactly one index entry for 'Jewry'—RW
[Belloc tries to show ‘the whole texture of the Jewish nation.. is at issue with the people among whom they live.’ This is not a very satisfactory chapter, as for one thing there’s not much evidence about life in (e.g.) medieval Poland or Spain, from which to generalise. Belloc thinks for example that ‘The Jew concentrates upon one matter.’
Although it doesn’t really fit in
‘The Jew has this other characteristic which has become categories increasingly noticeable in our own time, but which is probably as old as the race: and that is a corporate capacity for hiding or for advertising at will: a power of “pushing” whatever the whole race desires advanced, or of suppressing what the whole race desires to suppress. .. the general capacity and instinct of the Jew for corporate action in the “booming” or “soft pedalling” of what he wants “soft pedalled” is ineradicable. It will always remain a permanent irritant. The best proof of it is that after the most violent “boom,” after the talents of some particular Jew, or the scientific discovery of another, or the misfortunes of another, or the miscarriage of justice against another, has been shouted at us.

Pointed and iterated until we are all deafened
there comes an inevitable reaction, and the same men who were half hypnotized into the desired mood are nauseated with it and refuse a repetition of the dose.’
[Belloc adds later, p. 107:] ‘It is not always recognized in this connection that the Jewish “booms,” which are so fruitful a cause of exasperation, depend on this same policy of concealment and on that account add to the volume of anger as each new trick is discovered.
Not that the objects of these world-wide campaigns are unworthy of attention. The Jewish actor, or film-star, or writer or scientist selected is usually talented; the victim of injustice whose case is advertised on the big drum has often a genuine grievance. But that the notice demanded is out of all proportion and that its dependence [sc. is] on Jewish organization is always kept hidden.’ [Charlie Chaplin and Einstein?