>> in the mid 1980s almost all of the sources and informants have dispiered. almost five years they searched for a traitor within. >> i often wondered how long it took them to be caught. only thing i could come up with is they were great officers smart people dedicated people but they lived through the awful era of angelton. >> the infamous james jesus angelton was director of counterintelligence for 20-years in 1974. he was the inspiration for the matt damon character in "the good shepherd." >> he was convinced the russians had plans that weren't there. the agency didn't want to go through that again. >> nevertheless it was cia analyst who in 1991 made it her