Stalin’s deadly spy in the Fourth Internationale

"Mark Zborowski was the most notorious and deadly agent of the Soviet secret police (the GPU) inside the Trotskyist movement in the 1930s. He played a central role in setting up leading members of the Fourth International, including Trotsky’s son, Leon Sedov, for assassination. Zborowski survived his victims by many decades. Arriving in the United States in 1941, he made the transition from Stalin’s leading anti-Trotskyist agent to a highly successful academic in prestigious American universities. Zborowski’s eventual exposure as a Stalinist agent in the 1950s only temporarily derailed his academic career. But in 1975, as a result of the International Committee of the Fourth International’s investigation into the events leading up to the assassination of Trotsky in 1940, Zborowski’s crimes were brought to public attention. The GPU assassin was photographed in August 1975 in San Francisco outside his home by David North, a leading member of the Workers League (predecessor of the Socialist Equality Party). During the decade that followed, the International Committee’s investigation into the crimes of the GPU against the Trotskyist movement—whose findings were published under the title “Security and the Fourth International”—produced a wealth of new information about Zborowski’s activities. In June 1990, two months after Zborowski’s death, the International Committee published an obituary which reviewed the murderous career of this Stalinist agent. This obituary is republished below":

http://www.wsws.org/articles/2011/nov2011/zbor-n17.shtml