The American Civil Liberties Union (ACLU) is a non-profit organization that works to defend and preserve the individual rights and liberties guaranteed by the Constitution and laws of the United States. The organization was founded in 1920 and has since grown to become the nation's largest public interest law firm, with a staff of over 300 attorneys and thousands of volunteer lawyers and activists. The ACLU works on a wide range of issues, including free speech, racial justice, reproductive rights, LGBT rights, and criminal justice reform. The organization is headquartered in New York City.