It's the Académie Française. The Alliance Française is a network of centers in cities throughout the world that provide French classes and promote French culture.
I wish the US was as concerned about preserving English as a primary language as France is about preserving French. While I was living in Miami, I got really tired of having to press 1 for English.
France had French as its official language, yet many now prefer English. The U.S. DOES NOT have an official language, yet EVERY SECOND GENERATION American speaks the language (even in Miami, where I lived for three years in a Colombian neighborhood).
If French culture were erased from the face of the earth, we would miss, uh, TinTin? The Michelin Man?