The True Freaks Union is an organization of persons born or through some unfortunate accident has become a freak. They were seen in the Season Six episode, "Freak Strike". The public service video and song parody the real PSA from International Ladies Garment Workers Union (ILGWU).
True Freaks Union PSA Lyrics
Butters: Look for the True Freak label
All the Freaks: When you are watching a TV talk show
Remember somewhere, our union's growing
Our wages going to feed the kids.
And run the house-
We work hard, but who's complaining?
With TFU we're making our way!
So always look for the True Freak label,
Because you need us right here in the U.S.A.!