Odd history I did not know

There's a lot of history about, so can I forgiven for not knowing this until it turned up in a Twitter thread recently?:

Stetson Kennedy, a folklorist and social crusader who infiltrated the Ku Klux Klan in the 1940s and wrote a lurid exposé of its activities, “I Rode With the Ku Klux Klan,” died on Saturday in St. Augustine, Fla. He was 94.

The cause was complications of bleeding of the brain, said his wife, Sandra Parks.

Mr. Kennedy developed his sense of racial injustice early. A native of Jacksonville, Fla., he saw the hardships of black Floridians when he knocked on doors collecting payments for his father’s furniture store. His social concerns developed further when he began collecting folklore data for the Federal Writers’ Project in Key West, Tampa and camps for turpentine workers in north Florida, where conditions were close to slavery.

After being rejected by the Army because of a bad back, he threw himself into unmasking the Ku Klux Klan as well as the Columbians, a Georgia neo-Nazi group. He was inspired in part by a tale told by an interview subject whose friend had been the victim of a racial murder in Key West.

As an agent for the Georgia Bureau of Investigation, Mr. Kennedy, by his own account, infiltrated the Klavern in Stone Mountain and worked as a Klavalier, or Klan strong-arm man. He leaked his findings to, among others, the Washington Post columnist Drew Pearson, the Anti-Defamation League and the producers of the radio show “Superman,” who used information about the Klan’s rituals and code words in a multi-episode story titled “Clan of the Fiery Cross.”

That's from his New York Times obituary, and it goes on to note some controversy over his claims, and this is explained in lengthy detail at Wikipedia. 

The main reason I am inclined to post about it is because I didn't know the KKK was mocked in the Superman radio show.  According to this site's account, the show really was influential in the decline of the outfit:

The Superman writers created a thinly disguised version of the Ku Klux Klan for "The Clan of the Fiery Cross". A newly revived Klan had emerged in the aftermath of WWII and was making plans to expand recruitment into the Industrial Belt and the West. Folklorist Stetson Kennedy had infiltrated the Florida branch of the revised Klan to learn their secrets and became understandably frightened by what he had learned. Even more frightening, when Kennedy presented his discoveries to local authorities, the police were either frightened to move against the Klan or were already under Klan control. However, Kennedy was able to share his information with the Superman writers.

"The Clan of the Fiery Cross" story arc was developed and broadcast in June of 1946. The story begins with Jimmy Olsen managing the Unity House baseball club and excited over their prospects with new pitcher Tommy Lee whose family recently moved to the neighborhood. Naturally, this upsets the team's former pitcher, Chuck Riggs, who crowds the plate during batting practice and accidentally gets beaned. Riggs' uncle Matt, the Grand Scorpion of the Clan of the Fiery Cross, decides that Tommy Lee and his family are not "real Americans" (it is not revealed until the third episode that Lee's family are Chinese and his father was appointed to the city medical department over one of Riggs' friends).

Through most of the sixteen episodes of the "Fiery Cross" story arc, the Clan and its Grand Scorpion manage to stay one step ahead of the Man of Steel until they try to execute Jimmy Olsen and Daily Planet editor Perry White. Superman steps in with seconds to spare, but the Grand Scorpion escapes to confer with the Clan's national leader, the Grand Imperial Mogul. The Mogul berates the Grand Scorpion for actually believing the Clan's racist propaganda, stating that it was simply a device to get new members and that the Clan's hierarchy was taking a cut on the sale of robes. The real KKK found nothing amusing about the story arc and tried to start a boycott against the sponsor, Kellogg's PEP Cereal. By this point, the Klan had been made to look foolish, the boycott went nowhere, and Mutual reported an increase in Superman's ratings.

Interestingly, the Fiery Cross story arc kept the actual Ku Klux Klan thinly disguised, but the real damage to the Klan came in the fourteenth episode when Matt Riggs visits the national leader, The Grand Imperial Mogul of the Fiery Cross. The Mogul cannot believe that Riggs believes the hatred hokum the group uses to attract "the suckers". Had the Klan simply ignored Superman's accusations, the revelations of their ceremonies and codes probably would have dismissed or forgotten. Instead, the Klan began calling for a boycott against the program's sponsor, Kellogg's PEP Cereal. To Kellogg's credit, the folks in Battle Creek stood by the Man of Steel. The Klan's reputation and power depended upon their mystique. With their ceremonies and secrets revealed and made to look ridiculous, the Klan's mystique and power evaporated. Recruitment dried up in the months after "The Clan of the Fiery Cross". The Klan resurfaced briefly in the late 50's and early 60's, but they were recognized as being little more than a white supremacist terrorist group with little or no political power. The most important lesson of The Clan of the Fiery Cross is that the power of hate groups evaporates when the light is shone on them and their tactics. 

Yay for Superman, I guess...