At the end of October, the United States quietly signed a deal with Colombia - its staunchest ally in Latin America, and the largest recipient of US military aid in the hemisphere. The agreement guarantees the United States access to Colombian military bases for the next ten years. The event went practically unnoticed in Washington. But it raised a storm of protest from South American governments threatened by the specter of US military intervention in the region. Fault Lines traveled to Colombia to investigate why US access to the bases is a cause for so much consternation.