Frequent SCOTUS friend of the court

• Censorship-fighting group: Abbr
• Org. concerned with due process
• Org. that defends individual rights
• They're certainly not dead to rights: Abbr
• Rights-defending org
• Org. with a Legislative Scorecard
• Organization concerned with freedom of speech: Abbr
• Organization that frequently defends PETA
• Org. fighting for immigrants' rights

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