Among those locked up was Alexei "The Tractor" Petrov, a former Bulgarian commando and secret agent, who served as adviser to the former head of the State National Security Agency (DANS) until last year.
Printre cei închişi se numără Alexei "Tractorul" Petrov, un fost agent secret şi de comando bulgar, care a avut până anul trecut funcţia de consilier al fostului director al Agenţiei de Stat pentru Securitate Naţională (DANS).