This series consists of legal case files which cover the widest range of civil liberties issues. It contains briefs and other pleadings, correspondence, memoranda, and notes. There are over 5500 folders representing approximately 3000 individual cases, many of which went before the U.S. Supreme Court. The Legal Case Files series is not a comprehensive representation of the cases in which the ACLU has been involved. Some records have yet to be transferred to Princeton and are still being maintained by the ACLU Legal Department. The series is arranged alphabetically by case or individual name. Files may appear listed under either the plaintiff's or the defendant's names. Also some cases are filed under a subject heading such as "Gay Rights Task Force" or "Airport Searches". One should also consult the MCA/UMI Microfilm guides for the case files series which may contain copies of ACLU legal briefs filed for many of the cases listed here.

This subseries consists of publications produced by the ACLU and is broken down into the following sections: