Robert Paxton’s Anatomy of Facism (https://www.penguinrandomhouse.com/books/128540/the-anatomy-..., https://en.wikipedia.org/wiki/Robert_Paxton#Fascism for a 5 min overview) is a fairly compact historical overview of the rise of fascism in post-WWI Europe, and analyses the historical/cultural/material factors for why facists came to power in Italy and Germany but not in eg England. It are mostly focuses on the dynamic cited in the grandparent comment re:

> At that point the ultrawealthy will seek to form an alliance with the growing popularity of the far right and seek to annihilate the left.

This is the third stage of Paxton’s five stages, the first three being:

> 1. Intellectual exploration, where disillusionment with popular democracy manifests itself in discussions of lost national vigor

> 2. Rooting, where a fascist movement, aided by political deadlock and polarization, becomes a player on the national stage

> 3. Arrival to power, where conservatives seeking to control rising leftist opposition invite fascists to share power