Here's the link:
http://www.militaresdemocraticos.com/articulos/en/20021231-01.html
It looks like these folks had a lot to lose by turning on Chavez. And some of the stuff they say about Chavez supporting FARC by providing safe havens is similar to stuff Carlos Castano, head of the AUC, was saying earlier.
At this point, I'd have to say Chavez is dirty.