40 U.S.C. § 3161

It is the purpose of this subchapter to promote and provide opportunities for individuals who wish to volunteer their services to state or local governments, public agencies, or nonprofit charitable organizations in the construction, repair, or alteration (including painting and decorating) of public buildings and public works that at least partly are financed with federal financial assistance authorized under certain federal programs and that otherwise might not be possible without the use of volunteers.