Americans United for Separation of Church and State (Americans United or AU for short) is a 501(c)(3) nonprofit organization that advocates separation of church and state. The separation of church and state in the United States is often accepted to be provided in the Establishment Clause of the First Amendment to the United States Constitution, which states "Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof."
AU has been labeled "liberal" by the Associated Press (AP) and a "liberal activist" group by Fox News.
