Gulag Archipelago actually illustrates this phenomenon in detail. If you read this essay by Eustace Mullins, you'll see exactly what happened: https://archive.org/details/mullins-e.-c.-theres-a-gulag-in-your-future-1976

On page 389, Volume Two of [The Gulag Archipelago], we find a very significant passage:

"But some transports of condemned zeks arrived too late, and they continued to arrive with five to ten people at a time. A detachment of killers would receive them at the Old Brickyard station and lead them to the old bathhouse to a booth lined with three or four layers of blankets inside. There the condemned prisoners were ordered to undress in the snow and enter the bath naked. Inside, they were shot with pistols. In the course of one and a half months about two hundred persons were destroyed in this way. The corpses were burned in the tundra."

In this passage, Solzhenitsyn is describing the execution of Trotskyite prisoners at a Moscow train station in April 1938. It sounds all too familiar, because hundreds of pages of sworn testimony describing these incidents were taken down at the Nuremberg Trials and used to condemn the legally elected officials of the German nation to be executed for "war crimes"! How did this come about? When the German Army made its lightning dash into Russia in June of 1941, the Soviet leaders realized that Jews in the captured border cities would be the first to collaborate with their conquerors. Stalin ordered all the Jews in the path of the German advance to be rounded up and hauled to the interior on cattle trains. Many of them were sealed, and most of them had no food or water. As a result, many thousands of Jews died in horrible circumstances. Also in the path of the German advance were a number of huge Soviet slave labor camps. There was no possibility of evacuating them, and the Russian guards herded prisoners into large groups and massacred them with machine gun fire. When the Germans captured these areas, they were stunned to find large mounds of unburied corpses.

In order to have proof of the savage mentality of the Communist commissars, the Germans methodically photographed the scenes of these massacres, and took statements from some survivors who had fled into the woods. At Nuremberg, in order to have a legal excuse for killing the captured Germans, the victors changed the statements and photos to read "German guards" where they had formerly read "Russian guards" and changed the locale of the massacres to read "Auschwitz", "Dachau" and other German camp areas instead of the true Russian ones.

Eustace worked at the Library of Congress for some 20 years and read thousands of books. So he would have actually had access to the original Nurmberg Trials transcripts (which were thousands of pages long) kept in their archives. You can view online facsimiles at the Library of Congress website here: https://www.loc.gov/rr/frd/Military_Law/NT_major-war-criminals.html

But, they're so enormous you'll never read it all. However, Eustace had a photographic memory. He had read large portions of the Nuremberg Trials, if not the whole thing, so when he read The Gulag Archipelago, he could compare his photographic memory of the Nuremberg Trials with the exact same stories occurring in the gulags. He did not make things up, and he was a brilliant scholar (contrary to popular opinion and the ADL's slander about him).

As u/fsoawesome pointed out also, Carlos W. Porter wrote a fascinating book called Made in Russia: The Holocaust (good book review, digital edition, hard copy). He actually digs through these very trial transcripts from Nuremberg and shows not only which ones were absurdly nonsensical, but which were directly manufactured in Russia. One of the very people in charge of manipulating these photographs, captions, and even making fakes, was Sergei Eisenstein, one of the only filmmakers in the USSR. It was a ruse from start to finish. Russia needed to explain where all the Jews' bodies went (killed in Gulags), and defeated Germany provided the perfect scapegoat.

Germany has also paid Israel hundreds of billions (if not trillions) of dollars since WWII, due to this misplaced blame. Who'd want to get rid of such a sweet gig? Certainly not Israel. Check out this short clip: https://www.youtube.com/watch?v=IRrfnGvSJDw