hearst helped make improvised explosive devices one of which failed to detonate in two unsuccessful attempts to kill policemen during august  marked money found in the apartment when she was arrested linked hearst to the sla armed robbery of crocker national bank in carmichael california she was the getaway car driver for the robbery in which a woman was shot dead by a masked emily harris thereby creating a potential for felony murder charges against hearst and making her a possible witness against harris for a capital offense