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In 1993 , Assistant Administrative Director Bill Whiteley established the first lien unit in Santa Ana , which used summary hearing type proceedings to efficiently clear up the backlog of cases where lien issues were left to be resolved . He is alleged to have sent a package of documents to the FBI 's office in Santa Ana , California in which he threatened to kill Zappa , claiming that he was angry with her and her late father Frank , prolific art-rock composer and driving force of the Mothers Of Invention , for allegedly stealing the lyrics to their 1982 hit US single ' Valley Girl ' from him .