J B S Haldane was an eminent British scientist (population genetics) and a Marxist. C S Lewis was…well, you probably already know who C S Lewis was.
In 1946, Haldane published an article critiquing a series of novels by Lewis known as the Ransom Trilogy, and particularly the last book of the series, That Hideous Strength. Lewis responded in a letter which remained unpublished for many of years. All this may sound ancient and estoteric, but I believe the Lewis/Haldane controversy is very relevant to our current political and philosophical landscape.