In the mid-1960s, King began to publicly criticize the Bureau for giving insufficient attention to the use of terrorism by white supremacists. Hoover responded by publicly calling King the most "notorious liar" in the United States. In his 1991 memoir "Washington Post" journalist Carl Rowan asserted that the FBI had sent at least one anonymous letter to King encouraging him to commit suicide. Historian Taylor Branch documents an anonymous November 21, 1964 "suicide package" sent by the FBI that contained audio recordings obtained through tapping King's phone and placing bugs throughout various hotel rooms over the past two years, and that was created two days after the announcement of King's impending Nobel Peace Prize. The tape, which was prepared by FBI audio technician John Matter, documented a series of King's sexual indiscretions combined with a letter telling him: "There is only one way out for you. You better take it before your filthy, abnormal, fraudulent self is bared to the nation". King was subsequently informed that the audio would be released to the media if he did not acquiesce and commit suicide prior to accepting his Nobel Peace Prize. When King refused to satisfy their coercion tactics, FBI Associate Director, Cartha D. DeLoach, commenced a media campaign offering the surveillance transcript to various news organizations, including "Newsweek" and "Newsday". And even by 1969, as has been noted elsewhere, "efforts to 'expose' Martin Luther King Jr. had not slackened even though King had been dead for a year. [The Bureau furnished ammunition to opponents that enabled attacks on King's memory, and ... tried to block efforts to honor the slain leader."