Todor Zhivkov to 1988, Bulgaria won an unprecedented 153 Olympic medals and numerous European and world competitions in sports as diverse as volleyball, rhythmic gymnastics and wrestling. Dissent was punished under Zhivkov's rule. The CSS was a feared tool of control, and overt opposition largely stayed underground until the late 1980s. In 1978, the Bulgarian dissident Georgi Markov was assassinated in London by an agent who stabbed him with an umbrella tip which implanted a very small ricin ball. According to former KGB general Oleg Kalugin, this was requested by Zhivkov and either performed by the KGB or it assisted the CSS;
Umbrella (newsletter) Umbrella (newsletter) Umbrella was an art newsletter or informal magazine that ran for three decades, from 1978 to 2008. Its focus was on artist's books and related media, and it has been credited as an important factor in the emergence and visibility of artist's books from Southern California. "Umbrella" was founded by curator Judith Hoffberg in 1978, and she remained its editor for the duration of its existence. Appearing irregularly, between 2 and 6 times a year, "Umbrella" focused on artist's books and related printed matter such as mail art, Xerox art, and photobooks. Hoffberg had a particular interest in