Todor Zhivkov to 1988, Bulgaria won an unprecedented 153 Olympic medals and numerous European and world competitions in sports as diverse as volleyball, rhythmic gymnastics and wrestling. Dissent was punished under Zhivkov's rule. The CSS was a feared tool of control, and overt opposition largely stayed underground until the late 1980s. In 1978, the Bulgarian dissident Georgi Markov was assassinated in London by an agent who stabbed him with an umbrella tip which implanted a very small ricin ball. According to former KGB general Oleg Kalugin, this was requested by Zhivkov and either performed by the KGB or it assisted the CSS;
1978 London bus attack Mihyi, was sentenced to life imprisonment for the attack. In 2000, Yulie Cohen Gerstel, one of the flight attendants injured in the attack, contacted Mihyi who was imprisoned at Dartmoor Prison. Mihyi was apologetic for his role in the terrorist attack. Gerstel advocated for his parole as shown in the 2002 documentary My Terrorist. 1978 London bus attack On 20 August 1978, a staff bus of El Al airlines in London was attacked by Palestinian terrorists. A flight attendant and one terrorist were killed in the attack, and nine people were wounded. At around 13:30, a minibus with staff of