Pedzisa mutsara unotevera: Pana 27 August 1965, Harrison akagadzwa kuva Mumiriri kuSoviet Union. Muna 1968, akava neukama hupfupi nomusikana wokuRussia aishanda paAmbassy yokuBritain. Harrison anoyeuka asina kubvunza kana kuziva kana aishanda kuKGB, asi akati zvaifungidzirwa kuti mushandi wose weSoviet pahofisi yeumishinari aishanda kana kuti aiva mumiririri webasa rakavanzika reSoviet. Apo zvinetso zvekuchengeteka zvakamuka pamusoro pe
Kubata kweSoviet kweCzechoslovakia, uye akanga atumirwa mifananidzo inopomerwa yakatorwa neKGB, Harrison akaudza Foreign Office nezvekusachenjera kwake, iyo yakakurumidza kugumisa kugadzwa kwake ndokumuyeuchidza kuBritain. Harrison akazivisa nhau yacho ku"The Sunday Times" pepanhau muna 1981.