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' can be broken down into four parts: American (AMER), CIVIL (CIV), Liberties (CIVIL), and UNION (UNION). AMER is an 8-letter word, CIV is a 3-letter word, CIVIL is a 5-letter word, and UNION is a 5-letter word. Together, these words form the acronym for the American CIVIL Liberties UNION.