IDK, most in Russian, may be you could find books of somebody like Klimov translated. Also you could take the most hateful authors who worte a lot about "Evil USSR Empire", open the part about tyrant Stalin and carefully look what exact crimes Stalin did to be named a tyrant. Surnames of his victims and their profession, ideology and all that stuff will tell you everything.

Stalin was definitely an authoritarian ruler with his own idea of Soviet Empire. He obviously didn't care about human lives if necessary, but accounted people as an only available resource that could be used to build his Empire. And unlike his political rivals from trotskists side he perfectly understand that population is not a cattle and have to be cared and treated with respect to be effective for his plans. All in all his rivals, who see USSR population only as a cannon fodder for their World Revolution, was unimaginably worse for regular people than tyrant Stalin. Trotskists didn't care about education, industry, science, health care, food supplies, anything, they hated Russians religiously and cared only about their ideology.