In the period 1936-45 the German signal intelligence agencies were able to intercept radio traffic from the interior of the Soviet Union (both Morse and radio teletype).
The information was included in their reports analyzing the Soviet economy.
Some of these reports are available from the CIA’s FOIA website, for example:
SOVIET UNION MILITARY - ECONOMIC REPORT
I downloaded as many of the reports that I could find and I’ve joined them into one pdf file (1.689 pages):
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