"Of all the persons mentioned in the Russian documents as well as by the witnesses throughout this inquiry, none, Soviet officials excepted, have been more repeatedly and prominently mentioned, either under their names or cover-names, than Fred Rose and his fellow spy and conspirator, Sam Carr." Thus read the first line of the espionage commission's final report in its chapter on Fred Rose. Rose was born in Lublin, Poland on 7 September 1907 and immigrated to Canada in 1920. As with Sam Carr, Rose traveled to Russia several times in the 1920s as a member of the Young Communist League. The commission alleged that it was at this time that Rose and Carr were trained by the Soviets to recruit espionage agents in the West. Rose was later elected to Parliament in 1943 as a member of the Labour Progressive Party from a Montreal riding and remains, to this day, the only candidate under the Communist Party's banner to be elected to Parliament in Canadian history. When brought before the commission, Rose refused to testify but was nevertheless convicted for conspiracy to violate the Official Secrets Act at trial.

The espionage commission's final report comments on Rose:

“Fred Rose (cover-names Fred and later Debouz) was born in Lublin, Poland, of Russian parentage on the 7th of September, 1907. In October, 1920, he came to Canada and later attained Canadian citizenship when, as a minor, his name was included in the naturalization certificate of his father, Jacob Rosenberg, issued on March 17, 1926. Fred Rosenberg has, for many years, used the name "Fred Rose", by which he is now generally known.
Twenty years after being granted the status of Canadian citizen and the freedoms, advantages and facilities of his land of adoption, which eventually permitted him to rise to the level of a legislator for the whole of Canada, being elected a Member of Parliament on the 9th August, 1943, and re-elected on the 11th June, 1945, Rose was arrested on charges laid under The Official Secrets Act, 1939.”