Apparently, there's a slogan about Morocco that goes "From Tangiers to Lagwira." Tangiers is in the north of Morocco, while Lagwira is a city in Western Sahara's south. When Moroccans say "Morocco: From Tangiers to Lagwira" they mean Western Sahara belongs to Morocco.
But here's the rub: Lagwira is outside the Berm, and outside of Moroccan control. The Moroccan government doesn't want this to be widely known, but the editors of Nichane knew better. They went to a government office and asked for a copy of the Lagwira phone book. Since they couldn't give them a phone book, they gave them a lawsuit, instead.
Update: Commenter Larbi Mansour for telling me Tangiers is the first city in the slogan. Thanks, Larbi.