The Wikipedia article is probably a good start, it mentions the book in which the paradox is described and some sources[0]. And here's an article discussing it as well as common conservative criticisms[1].

Also, in general you should avoid asking HN anything having to do with politics or philosophy. You're not likely to find neutral or good faith responses here.

[0]https://en.wikipedia.org/wiki/Paradox_of_tolerance

[1]https://medium.com/@parkermolloy/deconstructing-the-toleranc...