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
Hat tip Every Time". He continued drawing the hat tip box in the strip until his death in 1963. In the 2000s, the term "hat tip" (often abbreviated to "HT", "H/T" or "h/t") rose to prominence in the blogosphere to acknowledge someone who has made a significant contribution toward an effort, or someone who drew attention to something new or interesting. It is considered good netiquette when sharing a link or news item to give a hat tip to the person from whom you learned of the item. The on-line versions of the "Wall Street Journal" and "The New York Times" regularly