[3] According to Bulgarian journalist Hristo Hristov, Gullino was an occasional smuggler arrested twice in Bulgaria and given the choice of going to prison or becoming a secret agent in the West.
Based in Copenhagen with a cover as an art dealer, Gullino was supposedly active until 1990 and received two Bulgarian state medals “for services to security and public order”.
[5] A British documentary, The Umbrella Assassin (2006),[6] interviewed people connected with the case in Bulgaria, Britain and the United States, and revealed that Gullino was alive and well.
In March 2023 the Danish Broadcasting Corporation (DR) published a three-part documentary series[7] about the life of Gullino and his espionage activities.
The series brought special attention to an interrogation between Gullino and Scotland Yard detectives Christopher Bird and David Kemp that took place in 1993.