Bulgaria–United States relations to work. Bulgaria became a member of the Warsaw Pact on May 14, 1955. Though no Soviet troops were stationed on Bulgarian soil, in 1968, Zhivkov sent a Bulgarian division to join Polish, Hungarian and Soviet troops to crush a popular uprising in Prague. In 1978, the Bulgarian secret police were implicated in the assassination in London of Georgi Markov, a Bulgarian dissident who was a correspondent for the BBC World Service, Deutsche Welle radio and the U.S. sponsored Radio Free Europe. Markov was assassinated with a poisoned umbrella on September 7, Zhivkov's birthday. The rise of democratic movements across
Umbrella Magdalen Hospital, has the credit of being the first man who ventured to dare public reproach and ridicule by carrying one habitually in London. As he died in 1786, and he is said to have carried an umbrella for thirty years, the date of its first use by him may be set down at about 1750. John Macdonald relates that in 1770, he used to be addressed as, "Frenchman, Frenchman! why don't you call a coach?" whenever he went out with his umbrella. By 1788 however they seem to have been accepted: a London newspaper advertises the sale of 'improved