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Alger Hiss a lawyer and U.S. public official accused in 1948 of having acted as a Communist spy in the 1930s. Convicted in 1950 on counts of perjury related to the investigation, Hiss was sentenced to five years in prison but maintained his innocence until his death (b.1904--d.1996).
hiss to produce a sound by pushing air past teeth held close together, as if prolonging an "s." [4 definitions]