Continuing the series in which Timothy Garton Ash ' examines the demise of the communist regimes in eastern Europe. Big Brother. Garton Ash tracks down a man who once spied on him General Kratsch, ex-head of counter-intelligence for East Germany's Stasi - and examines the legacy of the totalitarian state. Arena: Looking fbrthe Iron Curtain follows. Producer Frederick Baker ; Executive producer Keith Bowers (S) (W)