Defendant's friend, often

• Org. since 1920 with many staff lawyers
• Org. fighting for LGBTQ rights
• National Advocacy Institute org
• Vocal opponent of 2001's Patriot Act, for short
• Frequent SCOTUS friend of the court
• First Amendment supporter
• Org. with a "Speak Freely" blog
• Citizens' rights org
• Org. in many civil rights cases

Wiktionary Word definitions in Wiktionary
n. (initialism of American civil Civil liberty Liberties union Union English)