This article introduces the topic of pandillas (street gangs) and their im- plications for security in Central America. There is minimal scholarly literature on pandillas and security. In part this is due to serious challenges in analyzing pandillas. First, pandilla members consider truth to be situational; data derived directly from them is suspect. Second, those who know most about them are involved in NGOs that rely on foreign assistance for their work. The project reports they produce go to funders abroad and are generally not published. Third, to research and write on pandillas is dangerous.