Somewhere between 100,000 and 150,000 people have marched in Caracas in opposition to Hugo Chavez's proposed changes to the constitution, as you can see from the AFP photograph above.
If approved, the new constitution would eliminate presidential term limits, create forms of communal property and give greater powers to Chavez and his cronies.
Not surprisingly, many Venezuelans think the changes go too far - turning the oil-rich nation into "another Cuba".
The vote is on Sunday.