Venezuela's Supreme Court has overturned an amnesty for jailed opposition leaders approved by the opposition-controlled parliament.
About 70 activists opposed to President Nicolas Maduro's socialist government had been due for release under the law approved last month.
But the court declared the amnesty law unconstitutional.
President Maduro had condemned the law as an attempt to destabilise his leadership of the country.
The Supreme Court has consistently backed the Venezuelan government since the opposition triumphed in congressional elections in December.
In a statement, the court said the amnesty law was unconstitutional because it covered offences "that are acts of organised crime, which are not related to crimes of a political nature".