I'd like to know an accurate estimate of the deaths that can be attributed to Stalin's Regime. I'm fairly confident that estimates over 20 million are Cold War-era propaganda that attempted to portray the Soviets as equivalent to the Nazis. These are the figures of deaths I found on the massviolence.org page on Stalin.
Dekulakization
20,000 - The OGPU troika sentenced approximately 20,000 persons to death in 1930 (GARF 9401/1/4157/201). Mass arrests of "1st category Kulaks"
84,000 - Approximately 15% of deported(560,000) died in the months following deportation. First wave of "2nd category kulaks" deportations.
487,000 -The first general census of the "specially displaced" population on January 1, 1932 recorded only 1,317,000 individuals when 1,804,000 had been deported in 1930-1931, indicating a loss of nearly half a million individuals over a two year period. Third wave of "2nd category kulaks" deportations
The Great Famine
1,400,000 - between 1.1 and 1.4 million died of hunger or epidemics in Kazakstan.
4,500,000 - The estimated number of death by famine in the Ukraine and in Kuban varies from four million to four and a half million (Shapoval & Vassiliev, 2001; Danilov, Manning & Viola, eds, 2003, vol. III).
400,000 - The most afflicted areas were the Lower and Middle Volga where excess mortality reached 300,000 to 400,000 in 1933 (Kondrasin & Penner, eds, 2002).
151,000 - According to centralized statistics from the Department of Special Settlements of the Gulag, 151,000 "specially displaced" persons died in 1933
Great Terror
800,000 - Within sixteen months, over one and a half million persons were arrested. Half of these persons (800,000) were sentenced to death
Katyn Massacre
25,700 - Katyn Massacre
Grand Sum: 7,867,700 (approximately half that of the number killed by the Nazis in the USSR)
I assume many prisoners who were not executed died in prisons and mass deportations took a good deal of lives but I do not see how this number can increase signifigantly like the 20-30 million figure that is tossed around to "prove" Stalin killed more than Hitler.