Purpose: Address non-payment of taxes by reviewing all American tax-exempt nonprofit organizations form 990 for compliance with Section 501(c) of the United States Internal Revenue Code (26 U.S.C. 501(c))
Definition: A 501(c) organization, also known colloquially as either a 501(c) or a "nonprofit", is an American tax-exempt nonprofit organization. Section 501(c) of the United States Internal Revenue Code (26 U.S.C. 501(c)) provides that 28 types of nonprofit organizations are exempt from some federal income taxes. Sections 503 through 505 set out the requirements for attaining such exemptions. Many states refer to Section 501(c) for definitions of organizations exempt from state taxation as well. - 501(c) organization - Wikipedia