In 1967, after an encounter with Karl Gerold, he began working as an editor at the Frankfurter Rundschau,[1] where he was responsible for South America and Security Policy.
His telephone conversations with Thomas Schwätzer (Max Watts) were intercepted during 1973 by the US Secret Services as part of Project Penguin Monk.
[2] In December 1977, he was offered a position in the planning department of the Bonn Chancellery where he learned that for years he had been subjected to surveillance by the German authorities.
[3] In 1978 he received the Wächterpreis der Tagespresse, a German journalism award for excellence in investigative reporting, for his discovery that travelers who were found carrying literature considered left-wing extremist were being detained by the border police.
A number of works of nuclear holocaust fiction appeared in 1983, and Guha published his Ende: A Diary of the Third World War.