(FORTUNE Magazine) – MOSCOW -- Warmer superpower relations have not stopped a Soviet agency from spreading . . . charges that the FBI murdered the Rev. Martin Luther King Jr. and that the CIA massacred Jim Jones and 900 of his . . . followers in Guyana . . . The anti-American charges, and literally a hundred more like them, are contained in booklets published recently by ((the Soviet press agency)) Novosti . . . The deputy editor-in-chief of Novosti's North American department, Yevgeny A. Posdnyakov, says the slick publications are . . . part of the campaign for greater frankness . . . launched by Gorbachev. ''There is a need to write about everything so people will make up their own minds and understand things,'' Posdnyakov said in an interview. ''The demand that some zones be free from inquiry by journalists would be an attack on glasnost.'' -- From an AP dispatch.