The John Birch Society was a lunatic. extreme right-wing anti-Communist fringe group that reached its peak in the 1950s and early 1960s, so deeply out of touch with reality that even most Republicans tried to distance themselves from the crazies. (This was a time when there were moderate and even liberal Republicans, mind you.)
So over-the-edge wingnut was it that the folk music group the Chad Mitchell Trio not only recorded a song making fun of Birchers, but it was even reasonably popular. There is no subtlety to it, where you have to read between the lines. It's all laid out there bluntly (and hilarious) to scathing ridicule.
The song was written by the Michael Brown, who among his other songs was the equally funny and pointed, "Lizzie Borden," written for the famous show New Faces of 1952. (Another up-and-coming songwriter who wrote for that show was a fellow named Sheldon Harnick.)
Why is it so relevant even today?
The John Birch Society was co-founded by a fellow named Fred Koch. If that last name is familiar to you, it's because he's the father of David and Charles Koch.
So, here then from 1962 is "The John Birch Society."
Where the Koch Brothers come from.