Question: What international Jewish non-governmental organization based in the United States did Frank Zappa deny an apology in 1979(?
Sentence (from "Anti-Defamation League"): Describing itself as "the nation's premier civil rights/human relations agency", the ADL states that it "fights anti-Semitism and all forms of bigotry, defends democratic ideals, and protects civil rights for all", doing so through "information, education, legislation, and advocacy".
Relevant evidence: No