Don't know where you got "1 million executions." No more than 700,000 were condemned to death, and of those condemned many had their sentences reduced. Even if all 700,000 were killed, that still fits what I have actually said, you've been putting words in my mouth. Moreover, you'll want to read this excerpt from the book The Triumph of Evil, specifically page 74:

The claim that Stalin and other Soviet leaders killed millions (Conquest, 1990) also appears to be wildly exaggerated. More recent evidence from the Soviet archives opened up by the anticommunist Yeltsin government indicate that the total number of death sentences (including of both existing prisoners and those outside captivity) over the 1921-1953 interval (covering the period of Stalin's partial and complete rule) was between 775,866 and 786,098 (Getty, Rittersporn, and Zemskov, 1993). Given that the archive data originates from anti-Stalin (and even anticommunist) sources, it is extremely unlikely that they underestimate the true number (Thurston, 1996). In addition, the Soviet Union has long admitted to executing at least 12,733 people between 1917 and 1921, mostly during the Foreign Interventionist Civil War of 1918-22, although it is possible that as many as 40,000 more may have been executed unofficially (Andics, 1969).

These data would seem to imply about 800,000 executions. The figure of 800,000 may greatly overestimate the number of actual executions, as it includes many who were sentenced to death but who were not actually caught or who had their sentences reduced (Getty, Rittersporn, and Zemskov, 1993). In fact, Vinton (1993) has provided evidence indicating that the number of executions was significantly below the number of civilian prisoners sentenced to death in the Soviet Union, with only 7,305 executions in a sample of 11,000 prisoners authorized to be executed in 1940 (or scarcely 600/o ). In addition, most (681,692) of the 780,000 or so death sentences passed under Stalin were issued during the 1937-38 period (Getty, Ritterspom, and Zemskov, 1993), when Soviet paranoia about foreign subversion reached its zenith due to a 1936 alliance between Nazi Germany and fascist Japan that was specifically directed against the Soviet Union (Manning, 1993) and due to a public 1936 resolution by a group of influential anti-Stalin foreigners (the Fourth International which was allied with the popular but exiled Russian dissident Leon Trotsky) advocating the overthrow of the Soviet government by illegal means (Glotzer, 1968).

Stalin initially set a cap of 186,500 imprisonments and 72,950 death penalties for a 1937 special operation to combat this threat that was to be carried out by local 3-man tribunals called ''troikas" (Getty, Ritterspom, and Zemskov, 1993). As the tribunals passed death sentences before the accused had even been arrested, local authorities requested increases in their own quotas (Knight, 1993), and there was an official request in 1938 for a doubling of the amount of prisoner transport that had been initially requisitioned to carry out the original campaign "quotas" of the tribunals (Getty, Ritterspom, and Zemskov, 1993). However, even if there had been twice as many actual • executions as originally planned, the number would still be less than 150,000. Many of those sentenced by the tribunals may have escaped capture, and many more may have had their death sentence refused or revoked by higher authorities before arrest/execution could take place, especially since Stalin later realized that excesses had been committed in the 1937-38 period, had a number of convictions overturned, and had many of the responsible local leaders punished (Thurston, 1996)."

This is why relying exclusively on Wikipedia is silly, do some actual reading. A solid rule of thumb with respect to any Wikipedia article on enemies of the US is to look at where the figures and sources come from and analyze them yourself, as you can see Wikipedia made the error of conflating condemnations with executions.