What type of interest group is the ACLU?

The American Civil Liberties Union (ACLU) is a civil liberties interest group. It focuses on protecting and advocating for individual rights and freedoms, particularly those outlined in the U.S. Constitution, such as free speech, due process, and equal protection under the law. The ACLU engages in litigation, lobbying, and public education to promote civil rights and challenge government actions that it views as infringing upon these rights.