This is the text that gives the NFL (and other clearly for-profit organizations) non-profit, tax-exempt status*:

Business leagues, chambers of commerce, real-estate boards, boards of trade, or professional football leagues (whether or not administering a pension fund for football players), not organized for profit and no part of the net earnings of which inures to the benefit of any private shareholder or individual.

Sign the petition.

* No, that’s not a misprint. The NFL is considered tax-exempt, non-profit. Go figure.