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
Waterloo Bridge as the South Bank, which includes the Royal Festival Hall, Waterloo station, Queen Elizabeth Hall and the Royal National Theatre, as well as the BFI Southbank, which is directly beneath the bridge. The north end of the bridge passes above the Victoria Embankment where the road joins the Strand and Aldwych alongside Somerset House. This end housed the southern portal of the Kingsway Tramway Subway until the late 1950s. The entire bridge was given Grade II* listed structure protection in 1981. The nearest London Underground station is Waterloo, the nearest National Rail station is London Waterloo. Waterloo Bridge Waterloo Bridge