The American CIVIL Liberties UNION (ACLU) is a non-profit organization that works to protect CIVIL liberties and CIVIL rights in the United States. The acronym ACLU PART stands for American CIVIL Liberties UNION Part, which is a term used to refer to the organization's members. The first word of the acronym, UNION, is a five-letter word meaning an organized association of people formed to protect and promote their common interests. The second word, CIVIL, is also a five-letter word meaning relating to ordinary citizens and their concerns, as opposed to military or religious matters. The third word, AMER, is a four-letter word referring to the United States of America. Together, these three words form the acronym ACLU PART, which stands for American CIVIL Liberties UNION Part.