“Paradox of Tolerance” is a favorite slogan of censorship advocates. Most often they drop the words in a discussion without elaboration to give the impression they’ve said something profound. Some will mention its connection to Karl Popper. Few will cite his words, since they’re actually opposed to censorship.

The words in question are from a footnote in The Open Society and Its Enemies. The footnote is a bit unclear; Popper was adding a passing thought, not a polished commentary. Here are the words:
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