This is the government website for the SEC - US Securities and Exchange Commission.  The original documents for securities laws can be accessed from this page.  These laws include:
Securities Act of 1933Securities Exchange Act of 1934Trust Indenture Act of 1939Investment Company Act of 1940Investment Advisers Act of 1940Sarbanes-Oxley Act of 2002Dodd-Frank Wall Street Reform and Consumer Protection Act of 2010Jumpstart Our Business Startups Act of 2012
This is helpful for business law classes that include business ethics.  The Sarbones-Oxley Act is a great resource when studying Enron and other related ethical scandals of that time.  The full text can be used for close reading and digital scavenger hunts.