Why are so many autocrats germaphobes? Why was the truth so dangerous for Soviet engineers? And what can salami reveal to us about the mind of Vladimir Putin?

This is the first of two special episodes in partnership with HBO's new series "The Regime". Tim Harford investigates real-life dictatorships and the social science that explains them, drawing on insights from game theory and psychology.

For a full list of sources, see the show notes at timharford.com.