Possible Clues:

• Constitutional rights grp.
• Censorship-fighting gp.
• 2006 NSA suer
• First Amdt. lobby
• Org. with an amicus brief in Brown v. Board of Education
• Org. that's against the death penalty
• Org. co-founded by Jane Addams
• Frequent GOP bogeyman
• Defender of some unpopular causes: Abbr.
• Free speech org.