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rd @Qekland 2, California. The @nvelope was addressed to Sanator Joasph McCarthy, Senate Office Suiiding, Washington, D. Ce In the usper riehthand corner is affixed two 2¢ of peatere stamps bearing the cancellation “California public Schools Week april 2 Visit Your Schools." ‘he envelope contained no return address. The envelope and anonymous latter were typewritten with a red ribbon. The orifinal letter oid envelope are being retained in tae files of the FFI Labor..tory. <A comparison will be made in an effort to detcrmine the type and make of typewriter used to prerure tie Comnnication. You will be advised of results of this comparison und furnished wita photographic coplea of the letter and envelope, Any further comparison or examination s.ieulc be requested by you of the FBI laboratory. . 5 Present immedi ly to USA for opinito. as to whether violation exists and“whc thr presecution will >e instituted, Be guided by hie o-imion and sutel rosults this conference. If investigat!on corducted afford continuous attention until brou :.t to a logics) conclusiome Sac Wali, tongs offies furnish infermatian