An excerpt of his thoughts on this subject, very interesting to contemplate the political implications of this:

"The Most Intolerant Wins: The Dictatorship of the Small Minority" [0]

[0] https://medium.com/incerto/the-most-intolerant-wins-the-dict...

"...Clearly can democracy –by definition the majority — tolerate enemies? The question is as follows: “ Would you agree to deny the freedom of speech to every political party that has in its charter the banning the freedom of speech?” Let’s go one step further, “Should a society that has elected to be tolerant be intolerant about intolerance?”

> Popper abhorred philosophers who argue that scientists adhere to theories for cultural and political rather than rational reasons.

And so is also Popper's student George Soros.