Majdanek documents: https://docs.historyrussia.org/ru/nodes/354230
Treblinka documents: https://docs.historyrussia.org/ru/nodes/354229
I AI-translated the Treblinka documents into English and posted on the Wiki. But you can also go to the Russian website and use a browser translator to auto-translate.
Majdanek discussion: Wetzelrad read through the Majdanek documents and added some analysis. He might repost that here or add more thoughts?
Treblinka discussion: the main focus of the Treblinka interrogations/report is the deportation of US and British citizens to be killed at Treblinka. They are said to have been among the first deportees/victims of the camp.
Interestingly, the ESC conflates the T-II camp with the T-I camp, concluding that Baron van Eupen was commandant of the camp, which had a gassing installation for killing American/British citizens.
There were 3 other Soviet investigations of Treblinka before the ESC: August, September, and SMERSH in September/November. So the ESC had several reports and several months to straighten out the difference between T-I and T-II and ended up with van Eupen and Franz in charge. No mention of Stangl at all.This brutal extermination was carried out primarily by gassing in a specially equipped room. Some prisoners were shot.
[...]
All atrocities at the Treblinka camp were carried out by the Germans under the direction and with the personal participation of the camp commandant, Baron van Eupen.
[...]
On the basis of the investigation carried out, the Extraordinary State Commission established that this monstrous crime – the extermination of US and British citizens – was committed by the commandant of the Treblinka camp, Baron van Eupen, the head of the camp, Oberscharführer Franz...
- from the Draft Report
Of the people interrogated by the ESC, several make appearances later. Oskar Strawczynski was at the 1945 Polish site visit and has published memoirs ("Ten Months in Treblinka"). Aleksander Kudlik was also at the site visit. Two of the maps on the DeathCamps.org website list Kudlik as a source.
The Poles attempted to interviews others, like Mendel Koritnicki, Wolf Szejnberg, and Pinkhus Weissman, and were unable to find them for the 1945 investigation.
Short look at 1944 Soviet/1945 Polish investigation overlap here.
Majdanek-Treblinka link: the reason I've included both in one thread so far is the involvement by Dmitry Ivanovich Kudryavtsev. One of the Russian books listed above states this about Kudryavtsev:
Klaus Schwensen examined the "genesis of a propaganda project" of the ESC's report on Sachsenhausen, which also involved D. I. Kudryavzev/Kudryavtsev. Schwensen found six drafts of this report.Dmitry Ivanovich Kudryavtsev was an engineer-economist and specialist in international law. In the 1920s, he worked at the Soviet trade mission in Vienna. He was one of the most active members of the Extraordinary State Commission (ChGK). In August 1944, he served as deputy chairman of the Polish-Soviet Extraordinary Commission for investigating German atrocities at Majdanek in Lublin.
The report on Treblinka has numerous corrections/edits and exists in two versions. The Majdanek documents also show numerous edits, some material changes to the actual testimony of witnesses.
Neither the ESC's Sachsenhausen report nor the Treblinka report were published.
Although the ESC was large and expansive, there are some key links between the investigation of these three camps, especially in the personal involvement of Dmitry Ivanovich Kudryavtsev.