He differentiated between both phenomena as follows: The term historicism is used in his influential books The Poverty of Historicism and The Open Society and Its Enemies to describe “an approach to the social sciences which assumes that historical prediction is their primary aim, and which assumes that this aim is attainable by discovering the 'rhythms' or the 'patterns', the 'laws' or the 'trends' that underlie the evolution of history”.
Moreover, Hook calls Popper's treatment of Hegel "downright abusive" and "demonstrably false", noting that "there is not a single reference to Hegel in Hitler's Mein Kampf".
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Among them were Ernst Gombrich (entrusted with the main task of finding a publisher), Friedrich Hayek (who wanted to get Popper to the London School of Economics and thus was enthused by Popper's turn to social philosophy), Lionel Robbins, Harold Laski (both of whom reviewed the manuscript), and J.N. Findlay.
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In The Open Society and Its Enemies, Popper attacks "historicism" and its proponents, among whom (as well as Hegel) he identifies and singles out Plato and Marx — calling them all "enemies of the open society".