The Americans

It was not difficult to figure out where the Arc to The Americans Finale came from. It's only the very best cold open of ANY show.

 
Ok, but having the Stalinists kill off Phillip and Elizabeth wouldn't have made any sense. It would have gone against the historical record and cheapened the series. The Stalinists lost their power under Gorbachev and were eventually crushed by Yeltsin in 1993.

Totalitarianism never had a long shelf life.