I just learned they're making a full movie based on the book Superman Versus The Ku Klux Klan by Rick Bowers. And its a real life story!
Back in 1946, a man named Stetson Kennedy infiltrated the KKK and learned a lot of their more sordid practices and secrets. He tried to interest local authorities, but back then the KKK had its fingers in a lot of pies, and the authorities were uninterested in doing anything. So in a weird but admittedly masterful twist, he ended yup taking what he learned to the producers of the Superman radio show, which was very popular at the time. They created a storyline using Kennedy's expose material called "Clan of the Fiery Cross" which ran for 16 episodes. It is credited with helping to turn popular opinion against the Klan. I know the original episodes of "Clan of the Fiery Cross" of the Superman radio show episodes are available on youtube, the last time I checked.
I have no idea if the movie is going to be any good or not, but the real story its based on has always intrigued me. Here's hoping the filmmakers can do it justice.