The SEC website contains summaries and the text for some of these laws. An overview of specific statutes as well as a history of securities law can be found at the Legal Information Institute.
U.S. statutes can be found on a variety of free and fee-based sites:
U.S. Government regulations are first published in the Federal Register and then codified in the Code of Federal Regulations or CFR. Title 17 of the CFR deals with the SEC.
The SEC summarizes some of its most important regulations here:
There are several online sources for the Code of Federal Regulations:
State laws that regulate securities are called 'Blue Sky Laws'. Generally, these laws pre-date the SEC were enacted to protect investors from fraud.
CCH's Blue Sky Law Reporter brings together information on all fifty states including statutes, rules, policy statements, interpretive opinions, no-action letters and decisions. This reporter is available from CCH, Lexis and Westlaw.
There is also Secured Transactions smartbook from the Illinois Institute of Continuing Legal Education that covers Illinois.