Federal Law can be divided into three broad areas: Statutory Law, Regulatory Law, and Case Law. The Statute is the law as it is passed by Congress. Regulations are rules that govern the enforcement of particular laws. These rules are developed by the Executive branch, which includes a wide variety of Federal agencies and departments. Case laws are legal precedents that come from Federal court rulings from the Supreme Court on down to the lower federal courts. The links below will direct you to online research pages and full text of official and unofficial U.S. government sources of Federal Law.
Search Congress.Gov for current or passed legislation.