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
Poisoned Pen Press Poisoned Pen Press Poisoned Pen Press is a publisher of hardcover mystery fiction in the United States. It is based in Scottsdale, Arizona. Poisoned Pen Press typically publishes thirty-six new hardcover mysteries per year, thirty-six new large type editions of those hardcovers, and between thirty and forty new trade paperback editions of previously published hardcovers. Audio books of new titles are produced by Blackstone Audio. All titles are distributed through Ingram Publisher Services. Poisoned Pen Press was founded in 1997 by Barbara G. Peters, Robert Rosenwald, and their daughter, Susan Malling. Peters, who had founded Scottsdale Arizona's 'The Poisoned Pen,