They would buy what they could not swap
(see that an accountant
was included in the swap of "goods" used by the Gulag officials for they private interest), that is to say: privileges, influence, relative safety, other things accessible only by paying bribes... like avoiding waiting list for surgery, obtaining the allocation of a large apartment when back in the city, buying children's inscriptions at university and diplomas, or avoiding judgement in the case of Ryazhnev... See Second economy
But whatever the details of the issue in Tavda, the presence of Prodanov and S. Kolevatov (with his son A. Kolevatov) in Tavda during 4 years, their positions of head of production and accountant, the purge, trials and sentences of the factory officials in 1944 and the violent death of S. Kolevatov that same year, the later presence of Prodanov and A. Kolevatov in Serov-Ivdel at the same time, the death of A. Kolevatov, the presence of Prodanov on the crime scene... are all facts and it is largely enough. Getting close to Prodanov turned out to be deadly for both father and son.
Now, I can sleep at night. That's it, thank you for the exchanges, kind Ziljoe.