The American Civil Liberties Union (ACLU) is a nonprofit organization founded in 1920 that focuses on defending and preserving individual rights and liberties guaranteed by the U.S. Constitution. It works through litigation, lobbying, and public education to protect freedoms such as speech, religion, and privacy. The ACLU addresses a wide range of issues, including racial justice, immigrants' rights, and reproductive freedom. By advocating for marginalized communities, the organization aims to ensure that everyone in the United States enjoys equal protection under the law and can exercise their civil liberties without discrimination.