That's a folk music wave, a conscious soul album, conflated with more pop social commentary. Not much protest songs. Products made out of popular discontent. Now if you said Woody Guthrie... But in pre-war times was there a non-mainstream?

The only thing that this may say is that in USA the regime fights dissent in mainstream media. Like, if you want to catch signs of a product made out of popular discontent, you can't e.g. find in UK charts the Sleaford Mods or Kneecap?