They gathered in the predawn dark. Bleary-eyed children squirmed. Adults lugging babies and backpacks stood at attention as someone working under the command of Colombia's most powerful drug cartel, the Gulf Clan, shouted instructions into a megaphone, temporarily drowning out the cacophony of the jungle's birds and insects: Make sure everyone has enough to eat and drink, especially the children. Blue or green fabric tied to trees means keep walking. Red means you're going the wrong way and should turn around.
