there's still no word from the kidnappers of patricia hearst. we sit by the phone and we answer them and we just hope that whoever has our daughter will turn her loose. >> as the hearst family waits for word from the kidnappers, the fbi develops a theory about their identity. >> the cyanide-tipped bullets were -- had become the trademark of the sla. they tried to put one at the scene of every crime, if you will. it was pretty conclusive that the sla was at it again. >> sla stands for symbionese liberation army, a radical fringe group of prison activists, feminists and vietnam veterans. escaped convict donald defreeze or cinque was their leader. >> there really was two types of people who formed the sla, one of them was a group of one, donald defreeze. then you had the other group, which were followers. the followers were basically white kids from berkeley that were a little too young to have participated in the social activism of the '60s. they had gotten on the scene a little too late. >> basically, we are talking about people who got caught up