I can believe that.
Here's what your link says: "Wikipedia does not have an article with this exact name." So you learned all you know about income from a Wikipedia entry that doesn't exist. As, apparently, did everyone else on Sui Juris. Didn't any of you guys notice that your link doesn't say anything?
Actually, I take that back. There are posters on Sui Juris who would notice that. You just aren't one of them.
If
Glenshaw Glass is important to you, though, we can take a look at the actual case
here. The Court framed the issue as follows: "whether money received as exemplary damages for fraud or as the punitive two-thirds portion of a treble-damage antitrust recovery must be reported by a taxpayer as gross income under 22 (a) of the Internal Revenue Code of 1939". If you are thus wondering whether the 1939 IRC taxed antitrust punitive damages, this is your case. Is that your question?
Even if that isn't your exact issue, the opinion contains language showing just how sweeping the term "gross income" is: "The sweeping scope of the controverted statute [defining "gross income"] is readily apparent ... This Court has frequently stated that this language was used by Congress to exert in this field "the full measure of its taxing power." (Citation omitted.) ... And the Court has given a liberal construction to this broad phraseology in recognition of the intention of Congress to tax all gains except those specifically exempted." The Court then concluded that, since nowhere in the IRC did Congress exempt punitive damages from the definition of "gross income", they were taxable.
Similarly, if whatever funds you are concerned about are not specifically exempted in the IRC, they are income to you, and taxable. That's the lesson of
Glenshaw Glass.
Hope this helps.