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WFO 9-3981 Enclosed for Bureau are three copies each and for all of which are postmarked Suffern, New York, dated in June, 1976. b6 On 7/20/76, SA Liaison Section, Usss, wDC,. b7C released to wFo copies of the six threatening letters and envelopes mailed to Victims. Review of usss file c02-69967 (New York note correct file number) revealed other names used by Unsub in letters to Vietims. All names included in title change. Lab, as indicated in referenced communication on 7/13/76, and file review of usss C02-69967, Laboratory has established the writer as one in same person who remains unidentified' to date. REQUEST OF THE LABORATORY The Laboratory is requested to handle Xeroxed copies of material as deemed appropriate.. LEADS NEW YORK DIVISION AT PEARL RIVER AND SURPERN, NEW YORK. Investigation continuing. HAIID NOLONIHTID AT wAshInGToN, D. C. Maintain contaet with Proteetive. Intelligence Braneh, Department of State and Usss, wDc, and advise same of prosecutive opinion of AusA, New York. ?