Margolis, Irving. Jewish; Single; Received Passport# 386578 on April 9, 1937 which listed his address as 1417 Manor Avenue, Bronx, New York; 35 years old; Arrived in Spain on May 5, 1937; Returned to the US on July 2, 1938 aboard the President Harding.

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Sources: Scope of Soviet Activity; RGASPI; Good Fight C; L-W Tree Ancestry.