Fifteen years before the clergy sex abuse scandal came to light, Archbishop Roger M. Mahony and a top advisor plotted to conceal child molestation by priests from law enforcement, including keeping them out of California to avoid prosecution. Memos written in 1986 and 1987 by Mahony and Msgr. Thomas J. Curry, then the archdiocese's chief advisor on sex abuse cases, offer the strongest evidence yet of a concerted effort by officials in the nation's largest Catholic diocese to shield abusers from police. The newly released records, which the archdiocese fought for years to keep secret, reveal in church leaders' own words a desire to keep authorities from discovering that children were being molested. In the confidential letters, filed this month as evidence in a civil court case, Curry proposed strategies to prevent police from investigating three priests who had admitted to church officials that they abused young boys. Curry suggested to Mahony that they prevent them from seeing therapists who might alert authorities and that they give the priests out-of-state assignments to avoid criminal investigators. The memos are from personnel files for 14 priests submitted to a judge on behalf of a man who claims he was abused by one of the priests. The confidential files of at least 75 more accused abusers are slated to become public in coming weeks under the terms of a 2007 civil settlement with more than 500 victims.