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"Chain Gang" is one of the "socially conscious" movies of that time. It was meant to publicize the brutal slave-labor incarceration system in the South.
In 1941, director Preston Sturges did "Sullivan's Travels," which was, in part, a satire of "Chain Gang." In "Sullivan's Travels," Joel McCrea plays a Hollywood movie director who wants to make a socially conscious film, titled "O Brother, Where Art Thou?"
He goes on the road to get in touch with "real" people, and gets dragged onto a Southern chain gang. Sturges seems to ask, why make movies that just tell people how bad life is? We all need a laugh instead.
And then in 2000 Joel and Ethan Coen directed a little film called, "O Brother, Where Art Thou?"
"O Brother" was sort of a satire of "Sullivan's Travels," sort of a witty take on Homer's "The Odyssey."
The Coens' film ended up saying ... hmmmm, still not quite sure what it was saying. But it has a great musical soundtrack of early country, gospel and blues.
So, in essence, we have a parody of a satire of a socially responsible film. Quite an achievement.