GNU Nazis Abandon Zeppelins Inexplicably (Sarcasm)
Just a first attempt.
GNU is Not A Zealot Institution, Surprisingly.
This would be a typical GNU-style recursive acronym. Like GNU is Not Unix (but GNU is in fact a kind of Unix, but then again, it isn't, because the proprietary nature of the trademarked "official" UNIX is exactly what GNU is "rebelling" against), I think GNU are no zealots, although they are often portrayed as such (to the extent that "GNU zealot" almost sounds like a pleonasm to some), but simply an organization with a project and a philosophy/ideology that they promote in what I consider to be a quite civil way, not a fanatic or violent way like the word "zealot" implies.
GNU Nazis Are Zero In Size
The nazi ideology and the GNU one are mostly completely unrelated (after all, software licensing was not really an issue in the 1930s in Germany), but to the limited extent that you could compare them, they seem pretty much incompatible. So I think the number of people who are simultaneously nazis and GNU supporters is most likely zero.