No, it is not. In our region, at the time of the Great Terror, there were no more than 2-3 percent of VKP/B members among the arrestees, in other regions even less. In Moscow and Leningrad the percentage might have been a little higher. Obviously, the share of VKP/B members within the total mass of victims of reprisal (arrested persons) does not differ considerably from their percentage within the entire population.
Among the Communists at that time there were also subjectively honest people, who seriously believed in all this Marxist nonsense. When they finally began to see clearly, they were already doomed to destruction. There is an example from our region, the partisans of Taseevsk.
The present Communists give proof of the fact that they have no regrets, since members of this party, under Stalin, were jailed and shot, as well. They only forgot to define, who admitted them into their own ranks: those who were shot? Or those who shot?