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What special department do you mean? I did not find it in the text.

Is there any evidence that the "mass killings" were deliberate? As you know around that time gained popularity a pseudoscientist Lysenko with his promises to increase the wheat production by multiple...

Yes. The term "Stalinist repressions" was invented later, by Khrushchev. The Khrushchev's aim was to indirectly attack Beria. Before that it was known as "Yezhovshchina". Stalin was the first to turn...

I do not know your skills in Russian but I suggest you to read this document signed by Stalin and Molotov:
Молотов В.М., Сталин И.В. Об арестах, прокурорском надзоре и ведении следствия:...

The spelling is quite similar to "holocaust"

This is a fragment of a film "Blokada" about Blockade of Leningrad. It shows the execution of 8 German war criminals on 05 Jan 1946, including former Pskov commandant Heinrich Remlinger. Of 11...

And here you can read more detailed description of the site you linked to:
http://actualhistory.ru/melnikoff

It seems that the chief editor behind this site is a known falsifier photographer...

Because any other people were not publicly hanged. Hanging was used by the Czarist Russia and by the Whites. The Soviets generally abandoned this practice with only a small exception during WWII.
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What you find bad in these executions? These are war-time public executions of pro-Nazi traitors, Nazi "polizei" staff, possibly SS-men and so on. That's why they were hanged, a very unusual practice...

Если вы назовете источник.

Что за источник цитаты, если не секрет.