The Blue Meanies are a fictional army of fierce, albeit buffoonish, music-hating creatures in the surreal 1968 Beatles film Yellow Submarine, who are set on the occupation (and silencing) of the colorful, musical world of Pepperland. They allegorically represent all the bad people in the world.
The Blue Meanies arrive in Pepperland and do everything they can to oppress the place. This prompts one of Pepperland's sailors, the former Commander now newly-appointed Lord Admiral "Old Fred" (or "Young Fred" according to the even older Lord Mayor) to fly out in the Yellow Submarine of the title to find the Beatles, who, as musicians, would be able to restore harmony (and indeed melody) to Pepperland. The Meanies, in his absence, cause Pepperland to turn into a very dull and oppressive place, wrought with thorns and thistles.
Later in the story, a Meanie abducts the Beatles' companion, Jeremy Hilary Boob, the Nowhere Man, and we see when the Beatles arrive in Pepperland how they have laid waste and petrified the natives. The Beatles find the stored-away instruments and their doubles, the Sgt. Pepper's Lonely Hearts Club Band, and bring music back to Pepperland. This restores color to the hills and plants and life into the natives (who had been petrified by various weapons in the Meanies' possession). With their spell thus broken, the Meanies cease to have a hold on Pepperland: even their guns start shooting flowers instead of missiles. Those that do not flee are invited by the Beatles to stay and "mingle" and they make peace with their former enemies.
The Butterfly Stompers: These are wide, bullying Meanies with cat-like faces. They each carry a number on their chest, and for whatever reason they find it entertaining to destroy butterflies. One of them also stomps upon Max's head at the Chief's behest (or possibly mistaking it for a butterfly too).
BTW, this is a remake of the old one that had to be archived because a school was built on the property. Feel free to claim it again even if you found the previous one. It's a new cache. And congratulations to MSASO for being FTF on the new cache!/font>