No, instead of putting them to death, they worked them to death. If they survived, they might get their freedom… and be watched by the KGB for the rest of their lives.
Also, to be fair, you have to look at specific time periods in Soviet and Russian history. Under some leaders, it was a very harsh prison sentence. Under other leaders, it was much worse.
They both use ActivityPub, so the two platforms can communicate with each other. I think it is just a matter of promoting your community.