ACLU on Boston Case: 1st Am. Requires Displaying Religious Flag

The ACLU has long fought to enforce the separation of church and state. We were the plaintiff in both Allegheny County v. ACLU and McCreary County v. ACLU, in which the Supreme Court held that the Constitution's establishment clause barred the displays of a creche and the Ten Commandments in county courthouses. So why are we supporting a Christian organization's argument in the Supreme Court case Shurtleff v. Boston that it has a right to display a flag bearing the Latin cross in front of Boston's City Hall? The short answer: The First Amendment requires it.