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On the 4th episode of this a Ukrainian US citizen is accused of being Ivan The Terrible a Nazi concentration camp guard who tortured and mutilated Jewish prisoners on the way to the gas chambers. He is deported to Israel to stand trial for war crimes. His family are standing by him and there are certain things that don't add up could be a mistaken identity its hard to tell so far. There is some pretty harrowing accounts from survivors of the camp of what they saw and went through themselves.
Worth the watch ill try finish it off later.