Glance at the memorabilia that fill Iván Roberto Duque's study in a house on the edge of a remote village in northern Colombia and you might think you have walked into a communist rebel's hideout.

Ernesto "Che" Guevara and Vladimir Lenin look down from pictures on the wall. Yet the room's symbolic artifacts belong to no leftwing rebel. Instead, this is home to "Ernesto Báez", nom-de-guerre of the political commander from Colombia's outlawed rightwing paramilitary army.