let go free

See: parole
References in classic literature ?
When my noble and learned brother gives his judgment, they're to be let go free," said Krook, winking at us again.
The Great Lie by Myrrha Stanford-Smith 'Phoenix,' he muttered self-consciously, not really expecting to be let go free.
Larnaca businessman Antonis Fanieros was let go free today on the advice of the Attorney-general's office following yesterday's retraction in court of three testimonies by an equal number of prosecution witnesses.