From an Essay by Walter Kaufmann:
One of the few things on which the analysts, pragmatists, and existentialists agree with the dialectical theologians is that Hegel is to be repudiated: their attitude toward Kant, Aristotle, Plato, and the other great philosophers is not at all unanimous even within each movement; but opposition to Hegel is part of the platform of all four, and of the Marxists, too. Oddly, the man whom all these movements take to be so crucially important is but little known to most of their adherents; very few indeed have read as many as two of the four books that Hegel published.
Hegel is known largely through secondary sources and a few incriminating slogans and generalizations. The resulting myth, however, lacked a comprehensive, documented statement till Karl Popper found a place for it in his widely discussed book, The Open Society and Its Enemies. After it had gone through three impressions in England, a revised one-volume edition was brought out in the United States in 1950, five years after its original appearance.
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Furthermore, Popper has relied largely on Scribner’s Hegel Selections, a little anthology for students that contains not a single complete work. Like Gilson in The Unity of Philosophical Experience (p. 246), Popper takes over such a gross mistranslation as “the State is the march of God through the world,” although the original says merely that it is the way of God with the world that there should be the State, and even this sentence is lacking in the text published by Hegel and comes from one of the editor’s additions to the posthumous edition of The Philosophy of Right — and the editor admitted in his Preface that, though these additions were based on lecture notes, “the choice of words” was sometimes his rather than Hegel’s.
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No conception is bandied about more unscrupulously in the history of ideas than “Influence.” Popper’s notion of it is so utterly unscientific that one should never guess that he has done important work on logic and on scientific method. At best, it is reducible to post hoc, ergo propter hoc. Thus he speaks of “the Hegelian Bergson” (p. 256 and n. 66) and assumes, without giving any evidence whatever, that Bergson, Smuts, Alexander, and Whitehead were all interested in Hegel, simply because they were “evolutionists” (p. 225 and n. 6).
[...]
Furthermore, Popper has relied largely on Scribner’s Hegel Selections, a little anthology for students that contains not a single complete work. Like Gilson in The Unity of Philosophical Experience (p. 246), Popper takes over such a gross mistranslation as “the State is the march of God through the world,” although the original says merely that it is the way of God with the world that there should be the State, and even this sentence is lacking in the text published by Hegel and comes from one of the editor’s additions to the posthumous edition of The Philosophy of Right — and the editor admitted in his Preface that, though these additions were based on lecture notes, “the choice of words” was sometimes his rather than Hegel’s.
[...]
No conception is bandied about more unscrupulously in the history of ideas than “Influence.” Popper’s notion of it is so utterly unscientific that one should never guess that he has done important work on logic and on scientific method. At best, it is reducible to post hoc, ergo propter hoc. Thus he speaks of “the Hegelian Bergson” (p. 256 and n. 66) and assumes, without giving any evidence whatever, that Bergson, Smuts, Alexander, and Whitehead were all interested in Hegel, simply because they were “evolutionists” (p. 225 and n. 6).