Magistrate judge says Jareh Sebastian Dalke, 30, is a possible flight risk, given the life sentence he could face and his alleged sympathies for Russia.
More than 35,000 inmates were released as part of the effort to ease pandemic conditions as long as they met certain criteria, including they were not likely a danger to others.
Health officials have been warning for more than a decade about the dangers of epidemics in jails and prisons, which are ideal environments for virus outbreaks
The Justice Department is creating a special task force to address criminal misconduct by federal Bureau of Prison officers at several correctional facilities.
A former U.S. intelligence officer convicted of trying to pass defense information to China was solemn as he was sentenced Tuesday to 10 years in prison and said he "would give anything" to change his actions.