The U.S. Marshals Service suffered a major security breach this month when hackers broke into and stole data from a computer system that included a trove of personal information about investigative targets and agency employees... The service, a division of the Justice Department, is responsible for the protection of judges, the transportation of federal prisoners and the operation of the federal witness protection program. The witness protection database was not breached, but hackers did gain access to information about some fugitives sought by federal authorities, according to a senior law enforcement official. Justice Department officials have determined that the breach,...