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 Road, London The road is designated as the A301, which continues across Waterloo Bridge. Waterloo Road, London Waterloo Road is the main road in the Waterloo district of London, England straddling the boroughs of Lambeth and Southwark. It runs between Westminster Bridge Road close to St George's Circus at the south-east end and Waterloo Bridge across the River Thames towards London's West End district at the north-west end. At the northern end near the river are the Queen Elizabeth Hall and the Hayward Gallery to the west, the National Film Theatre below the road, and the Royal National Theatre to the east.