the term “nonprofit organization” means an organization in which no part of its net earnings inures to the benefit of any private stockholder or stockholders, individual or individuals and, if a private entity, which is not disqualified for tax exemption under
section 501(c)(3) of title 26 by reason of attempting to influence legislation and does not participate in or intervene in (including the publishing or distribution of statements) any political campaign on behalf of any candidate for public office; such organizations may include States and units of local government (including public agencies or special authorities thereof), regional organizations of local governments and nonprofit societies, neighborhood groups, institutions, organizations, associations or museums;