Embarrassing Breach at F.B.I. Fuels Fears of Harm to Its Employees

In an internal memo, the F.B.I. said it believed the hackers may have stolen sensitive information on all of its employees.A criminal hacking group known as ShinyHunters said it had targeted the F.B.I. as retribution for its public warning in the spring that the group was known to harass its victims and their family members.