1. Section 501(c)(3) requires all of the following except no substantial portion of the organization may carry out propaganda, attempt to influence legislation, or participate in the political campaign of a public office. a measurement that indicates the average complexity of Medicare inpatients seen. the organization must "primarily" engage in private purposes, and no more than an insubstantial amount can benefit a private shareholder or individual purpose. the organization must serve a public interest rather than a private interest and may not be for the benefit of an individual or other party controlled by a private entity