On March 6, 1962, the FBI’s domestic intelligence division formally proposed a telephone wiretap and microphone surveillance device for Levison’s office. Robert Kennedy authorized the move. With no court approval needed, the office microphone was installed in mid-March. A wiretap on Levison’s phone began four days later. Agents began filing memos to headquarters on Levison’s conversations with King, and J. Edgar Hoover began passing along reports to Kennedy. The phone calls proved that Levison was a key adviser to King, but they failed to prove that Levison had any ongoing involvement in
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