The Comstock Law was a federal act passed by the United States Congress on March 3, 1873, as the Act for the "Suppression of Trade in, and Circulation of, Obscene Literature and Articles of Immoral Use". The Act criminalized usage of the U.S. Postal Service to send any of the following items:

• erotica,
• contraceptives,
• abortifacients,
• sex toys,
• or any information regarding the above items.