If you can't leave a country, then - as a fair rule of thumb - it's a dictatorship. Cubans died trying to escape from Castro's tyranny, in makeshift rafts across the sea to Florida. Not, of course, that that presents any problems to the Labour leadership and their Castro fetish.
And then there's Kim Jong-un's Democratic People's Republic:
Are Jeremy Corbyn and Dermot Hudson, our very own Songun defender, really all that far apart?
Update: Martin Bright at the Spectator - "We now have to recognise that a major political party in Britain is being led by a teenage romantic revolutionary who just happens to be in his sixties."