American Civil Liberties Union
noun
an organization founded in 1920 to defend the civil rights of all U.S. citizens. Abbreviation: ACLU, A.C.L.U.
Cultural definitions for american civil liberties union
American Civil Liberties Union
An organization founded in 1920 in the wake of the red scare to defend civil liberties. The ACLU has often defended the rights of individuals aligned with unpopular causes, including American communists and Nazis.