For easy access, you can read Title 27 - Code of Federal Regulations.
Laws
Section 205(e) of the Federal Alcohol Administration Act is the statutory provision regarding the labeling of alcohol beverages.
Regulations
Part 4 - Labeling and Advertising of Wine
Part 5 - Labeling and Advertising of Distilled Spirits
Part 7 - Labeling and Advertising of Malt Beverages
Part 13 - Labeling Proceedings
Part 16 - Alcoholic Beverage Health Warning Statement