I apologize if my previous responses were unclear or not sp…

I apologize if my previous responses were unclear or not specific enough. You're right that during the Soviet era, Christian religious groups faced extreme persecution as part of the state's campaign against religion generally and against perceived threats to its power. It is estimated that millions of Christians, including Orthodox Christians, Roman Catholics, and Protestant groups, were killed, although the exact number is difficult to determine and estimates vary. This was a significant part of the broader pattern of human rights abuses, repression, and mass killings under Stalin's regime. It's important to remember these tragic events of history so that they are not repeated.