Kammala wannan jumla: A ranar 27 ga Agusta, 1965, an nada Harrison a matsayin Jakadan a Tarayyar Soviet. A shekara ta 1968, ya shiga cikin ɗan gajeren lokaci tare da wani ma'aikacin gidan Rasha wanda ke aiki a Ofishin Jakadancin Birtaniya. Harrison ya tuna ba tambaya ko sanin ko ta yi aiki ga KGB, amma ya ce an ɗauka cewa kowane ma'aikacin Soviet a ofishin jakadancin ya yi aiki ko kuma wakili ne na asirin Soviet. Lokacin da damuwa na tsaro ya tashi a kan
Soviet mamaye Czechoslovakia, kuma an aika masa da hotunan da KGB ta dauka, Harrison ya sanar da Ofishin Harkokin Waje na rashin hankali, wanda nan da nan ya dakatar da shi kuma ya sake kiransa zuwa Birtaniya. Harrison ya bayyana batun ga jaridar "The Sunday Times" a shekarar 1981.