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Documents the exposure of Jack Esselwein, also known as Sergeant John Leopold, who, as an undercover operative of the Royal Canadian Mounted Police, joined the Communist Party of Canada. His identity was revealed after a series of police raids on August 11, 1931, which led to the arrest of a number of leading Communists, including Tim Buck. Esselwein testified at the trial in November 1931 whereby the Communists were convicted and sentenced to penitentiary terms under the notorious section 98 of the criminal code. They had already discovered that Esselwein was a police spy. The Toronto Daily Star report (published November 13, 1931) on Esselwein's unmasking is included in the article.