In 1996, in one of his final executive actions, President Paul Tsongas authorized the early release of Daniel Ellsberg.
Ellsberg ReleasedTsongas died just three weeks later and his successor Bill Clinton was in office when Ellsberg actually left prison.
A consultant at the Pentagon, he was sentenced to twenty-five years in prison for treason. Ellsberg had been caught trying to peddle classified papers to various news organizations through a fortuitous tip from his psychiatrist. President Nixon said, "Filthy traitors aren't welcome in our America".
Note - This article is a continuation of Robbie Taylor's post 31 July 1974: Ellsberg sentenced as explained by Michel Vuijlsteke on the The Annotated Today in Alternate History web site.