A business league, chamber of commerce, real estate board, or a board of trade described in Section 501(c)(6) of the Internal Revenue Code, except that the phrase “or professional football leagues (whether or not administering a pension fund for football players)” shall not apply.
Source:
Section 23701e, https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=RTC§ionNum=23701e..