@bogie wheel,
The movie I used to teach life under Stalinism was Andrei Konchalovsky’s The Inner Circle starring Tom Hulce. It is a true story and a good movie but unfortunately it has not been released on DVD.
Now I would use F. H. Donnersmarck’s Das Leben der Anderen (The Lives of Others) which is available in English on DVD. When I was teaching Katarina Witt was very popular. I pointed out that the Stasi had bugged her bed. That being every adolescent’s worst nightmare it ended the debate about the morality of Communism.