Well, now I've learned something. I had no idea that Dumas wasn't the sole author of his novels. (I'm not sure how he did it qualifies as a "factory", but perhaps it does.) Not only that, I had no idea that Dumas was the grandson of a Haitian slave. Or that Chirac had his body exhumed in 2002 and moved to the Pantheon. Best Wikipedia learnage I've had in some time!
Edit: there's one interesting point about how Dumas worked. He relied on collaborators to come up with the basic plots and characters. Then he did the detailed writing and stylistic fluorish. That's exactly the opposite of how most ghostwriting works, or so I imagine.