Harry Magdoff and espionage
Harry Magdoff was accused by a number of authors as having been complicit in Soviet espionage activity during his time in US government. He was accused of passing information to Soviet intelligence networks in the United States, primarily through what the FBI called the "Perlo Group." Magdoff was never indicted, but after the end of the Cold War, a number of scholars have inspected declassified documents (including those of the Venona project) from U.S. and Soviet archives.
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