You should talk to Upravlenie FSB of the region where members of your family had been arrested. UFSBs keeps the records and are in charge of answering such inquiries.
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They were arrested not in Russia proper, but perished (presumably) in Siberia. Thanks for the tip though

for me it’s hard to judge, for those members of my family what ended up in GULAG, never came back, actually nobody heard from them

You should talk to Upravlenie FSB of the region where members of your family had been arrested. UFSBs keeps the records and are in charge of answering such inquiries.

I guess A-bomb was of very good quality

Also in many cases the conditions of “free” workers were same or worth. As I told – one of my grandfathers survived the War in camps (1939-1949) but other one – “free” – died in 1941 as result of hard work, little food and lack of doctors (many of them were in Gulag – treating Solzhenitsyn).
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Ivanov,

for me it’s hard to judge, for those members of my family what ended up in GULAG, never came back, actually nobody heard from them (once they were arrested) or knows where they are buried. Maybe there were doctors, I don’t know.

This is why (IMHO), our capacity for sympathy/empathy/outrage turns off after a period of time exceeding three generations (the period of time in which one could have actually known people from previous eras). The murders committed by Stalin and Hitler and Pol Pot create outrage, but those committed by Nero or Genghis Khan are purely academic, even though all will real. If you were to stick Aunt Mable’s corpse in a case and set it up for public viewing, that would be an abomination, but you can do it with an Egyptian mummy. The catacombs of Paris are a tourist attraction. Few people worry about what the repercussions of our actions will be for people living hundreds or thousands of years in the future. This is because our minds do not handle large stretches of time well. If it’s further back than our great-grandparents’ day, or further ahead than our great-grandchildren’s, it might as well be fiction.

PS. in a few centuries, people will blow off the murders committed by Hitler, Stalin and Pol Pot just like we blow off those of Nero and Genghis Khan.

Overall, the slave labor (according to “Archiplag GULAG by Solzhenitcyn) didn’t produce high quality work.

I guess A-bomb was of very good quality

Also in many cases the conditions of “free” workers were same or worth. As I told – one of my grandfathers survived the War in camps (1939-1949) but other one – “free” – died in 1941 as result of hard work, little food and lack of doctors (many of them were in Gulag – treating Solzhenitsyn).

I do not know what proportions were, but I recall my grandfather’s stories of building Murmansk and Kandalaksha railroads. He was the ГИП and according to him, most of the work was done by prison labour. He had some sort of a drinking relationship with the chief of the local labour camp that and he was not onbly allowed to look at the list of new arrivals, but also to keep several of convicts sort of paroled at his word. Not because the system was lenient (as the Tzar’s system was when Lenin got exiled) but because even then a chiewf of a labour camp could have been bought денатуратом.

Sometime in 1980-s I happened to come across a book published in the USSR but out of print by then. It was Bukharin’s Экономика переходного периода (or a shorter version of задачи пролетариата в переходный период) with Lenin’s footnotes – the page was actually split into two columns for Bukharin’s text and Lenin’s. The amount of virtual blood in the book would make Freddy Kruger an Easter bunny. Stalin did not realty invent any of the terror methods. He borrowed quite heavily from Lenin, Bukharin and Trotsky.