Greece releases an elderly leader of a far-left militant group from maximum-security prison, according to reports. The individual, aged 82, is said to have led a group responsible for the killing of four American officials and 19 others, as described by outlets covering the case. Both sources state that the release follows a decision by Greek authorities, but also that the ruling is not necessarily final. The reporting indicates that the decision to release the prisoner could be reversed, implying further legal or administrative review. The sources do not provide additional details in the excerpts about the grounds for release, the timeline of the decision, or the specific process that may lead to reversal. Overall, the articles describe a development in a long-running case involving the leader of a militant organization tied to mass-casualty attacks, alongside uncertainty about whether the release will stand.