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
London Waterloo station July 1848 as "Waterloo Bridge Station". Nine Elms closed for regular services at the same time, but Queen Victoria was fond of the privacy afforded by the old station, so it was kept open for her, and a replacement private station built on Wandsworth Road in 1854. Waterloo Bridge was originally laid out as a through station, as it was expected that services would eventually continue towards the City of London. The L&SWR purchased several properties along the route, before the plans were cancelled owing to the financial crisis following the Panic of 1847. In October 1882, Waterloo Bridge station