The Immigration and Nationality Act (INA) was enacted in 1952. The INA is contained in the United States Code (U.S.C.). The U.S. Code is a collection of all the laws of the United States. Title 8 of the U.S. Code covers "Aliens and Nationality."
see 8 CFR 204.5(k) (Petitions for employment-based immigrants)
This is the centralized online repository for immigration policies. For Employment-based Immigrant Visa Petitions see 22.2