>> barsky: albrecht dittrich. say that three times real fast. >> kroft: just say it once slowly. >> barsky: albrecht dittrich. >> kroft: how albrecht dittrich became jack barsky is one of the untold stories of the cold war, an era when the real battles were often fought between the cia and the kgb. barsky was a rarity, a soviet spy who posed as an american and became enmeshed in american society. operational for the kgb, no one in this country knew his real story, not even his family. did you think you were going to get away with this? >> barsky: yeah. otherwise, i wouldn't have done it. ( laughs ) >> kroft: what barsky did can be traced back to east germany, back to the days when he was albrecht dittrich. a national scholar at a renowned university in jena, dittrich was on the fast track to becoming a chemistry professor, his dream job. >> barsky: didn't work out that way, because i was recruited by the kgb to do something a little more adventurous. >> kroft: spy? >> barsky: we called it something different. we u