Americans United for Separation of Church and State is a nonpartisan educational organization dedicated to preserving the constitutional principle of church-state separation as the only way to ensure religious freedom for all Americans.
Americans United, or AU, is a 501(c)(3) nonprofit educational organization based in Washington, D.C. Founded in 1947, Americans United works in the courts, in Congress and state legislatures, at the White House and in the arena of public opinion.