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 began to look for a terminus closer to Central London and the West End. An Act of Parliament was granted in 1845 to extend the line towards a site on York Road, close to Waterloo Bridge. The extension past Nine Elms involved demolishing 700 houses, and most of it was carried on a brick viaduct to minimise disruption. The longest bridge was long and took the line over Westminster Bridge Road. The approach to the new station carried four tracks, with the expectation that other companies would use it. The station was designed by William Tite and opened on 11