Linguistic Activism Organizations:An occasional Volokh Conspiracy feature describing these important advocacy groups (or should-be groups), which tirelessly work to improve our language. Today's featured group:Diaeresis Defense, an eleëmosynary reëducation coöperative.Favorite artists: The Brontës.Least favorite artists (winners of Diaeresis Defense's "Ersatz Dieresis Award"): Mötley Crüe.Slogan: "Two vowels, two sounds, two dots."Next week's feature: The Ligature League.