The Orwell quote is genuine, and can be found in Collected Essays, Journalism and Letters of George Orwell, on page 40, in an essay called "Freedom of the Park," which appeared in the Tribune on Dec. 7, 1945.

I found this using the Google books technique demonstrated by a cohort on the Castro quote. Using this technique for the Bradbury quote turned up no cited references, so it may be apocryphal. Stay tuned...