Inside Story S1991E05 - Fatal Encounter

During the 60s Colonel Oleg Penkovsky , a senior Russian intelligence officer, had proved himself to be 'our spy of the century'. For 16 months he passed the Kremlin's vital secrets to MI6 and the CIA.
Suddenly the KGB arrested Penkovsky along with the British businessman Greville Wynne. Their joint show trial abruptly terminated M16's precious asset. But how did the KGB find out about Penkovsky's activities? For the first time the KGB investigators and Penkovsky's CIA case officers disclose the innermost secrets of the case, and reveal that they blame MI6 for Penkovsky's demise.