The Northwestern Bloc of the Revolutionary Armed Forces of Colombia, also known as the Iván Ríos Bloc has historically been a strong influence in the Medellín and Antioquia regions, and still is today. It has been among the blocs most seriously targeted by former president Álvaro Uribe's defense plan and the Colombian Army's offensive. Due to this, the bloc has been forced to retreat to more remote areas of the countryside and has lost the dominance it once had in the area. The specific divisions of the group are arguable. Because of the current conflict existing in the country, much of the information recovered is conflicting. Some of the believed divisions or "fronts", as they are commonly called, are shown below. Many of these fronts sometimes work together towards a certain mission, while others are further divided into "columns" and "companies" with a smaller number of members. For more general information see FARC-EP Chain of Command.