I have to disagree somewhat. The original idea of gas was a "street car" which was modified. Running a supercharger does NOT kick you out of "gas" it just put you into "/GS"
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Prior to the "GS" class nomenclature for superchargd cars, the NHRA, at least, simply moved your car UP a class if you had a supercharger on it.
Your former D Gasser was now a C Gasser after you bolted on the 6-71...
That didn't work in an A class car, (nowhere to go!) so after a few years, the" GS" designation was born. I'm talking 1961, probably, for the "GS" moniker for the supercharged Gassers.
The blown A cars were given some screwed up nomenclature for awhile; I remember AA/GS on cars in the top forced induction class for a time...