Telephone Consumer Protection Act, 47 U.S.C. § 227 – Text of the federal TCPA law:
http://antitele.home.texas.net/laws/47usc.txt

FCC regulations, including fax restrictions, 47 C.F.R. § 64.1200 – Text of the FCC regulations: http://antitele.home.texas.net/laws/47cfr.txt