The one who did this:

"This contained official records of 799,455 executions (1921–1953),[7] around 1.7 million deaths in the Gulag,[8][9] some 390,000[10] deaths during the dekulakization forced resettlement, and up to 400,000 deaths of persons deported during the 1940s,[11] with a total of about 3.3 million officially recorded victims in these categories.[12] The deaths of at least 5.5 to 6.5 million[13] persons in the Soviet famine of 1932–1933 are sometimes, though not always, included with the victims of the Stalin era.[2][14]"

https://en.wikipedia.org/wiki/Excess_mortality_in_the_Soviet...