Ever since Bulgarian journalist Hristo Hristov successfully sued for the release of the intelligence file on Francesco Gullino in 2007, the world has known that Gullino, an Italian-born Danish citizen, began working for the Bulgarian secret service in 1971.
To this day, Gullino is considered the main suspect in the so-called “umbrella assassination” case: the murder of the Bulgarian writer and dissident Georgi Markov in London in 1978.
Markov was poisoned, probably with ricin, after being injected with a poisoned pellet when stabbed in the leg with the tip of a specially adapted umbrella at a bus stop in London.
