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28th August 1948: American State Department official, Alger Hiss, denying he was a member of a Communist cell before the House Committee on Un-American Activities in Washington. (Photo by William Bond/Keystone/Getty Images)

28th August 1948:  American State Department official, Alger Hiss, denying he was a member of a Communist cell before the House Committee on Un-American Activities in Washington.  (Photo by William Bond/Keystone/Getty Images)

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circa 1949: Two police photographs of former US State Department official and accused Communist spy Alger Hiss (1904 - 1996). (Photo by Hulton Archive/Getty Images)

circa 1949:  Two police photographs of former US State Department official and accused Communist spy Alger Hiss (1904 - 1996).  (Photo by Hulton Archive/Getty Images)

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26th June 1949: American lawyer and government official Alger Hiss (right) leaving a New York court with his lawyers during his trial for treason, where he was accused of being a soviet spy. (Photo by Keystone/Getty Images)

26th June 1949:  American lawyer and government official Alger Hiss (right) leaving a New York court with his lawyers during his trial for treason, where he was accused of being a soviet spy.  (Photo by Keystone/Getty Images)

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NEW YORK, UNITED STATES: Former State Department official Alger Hiss (L) and his wife leave the Federal Court 21 January 1950 after the jury found him guilty on two perjury counts. In 1948, Hiss was accused by the HUAC (House Un-American Activities Committee) of having been a member of the Communist party and of having handed official documents to the Soviet Union. His 1950 condemnation was due to the then investigator Richard Nixon. Nixon who became vice-president in 1952 and president in 1968, was very much involved in the anti-Communist witchhunt campaign instigated by John Parnell Thomas and Senator Joseph McCarthy. (Photo credit should read AFP/AFP/Getty Images)

NEW YORK, UNITED STATES:  Former State Department official Alger Hiss (L) and his wife leave the Federal Court 21 January 1950 after the jury found him guilty on two perjury counts. In 1948, Hiss was accused by the HUAC (House Un-American Activities Committee) of having been a member of the Communist party and of having handed official documents to the Soviet Union. His 1950 condemnation was due to the then investigator Richard Nixon. Nixon who became vice-president in 1952 and president in 1968, was very much involved in the anti-Communist witchhunt campaign instigated by John Parnell Thomas and Senator Joseph McCarthy. (Photo credit should read AFP/AFP/Getty Images)