In part three of our series about political conversions David talks to historian David Klemperer about the people who left Trotskyism behind – and where they ended up. From 1940s America to contemporary Britain, from the Second World War to the Iraq War, from James Burnham to Claire Fox, stories of one-time revolutionaries who found themselves in a very different place. What links Trotskyism to neoconservatism? And what happens when the renegade outsiders become establishment insiders?