Gerhardt was a South African national who spied for the Soviet Union for 20 years before his position was compromised by the Farewell Dossier.
Vitaly Yurchenko | Vitaly Petrov | Vitaly Ginzburg | Vitaly Daraselia | Vitaly Solomin | Vitaly Scherbo | Vitaly Rudakovskiy | Vitaly Popkov | Vitaly Kaloyev | Vitaly Efimov |