The intent of this monograph is to identify some of the most salient characteristics of contemporary criminal street gangs (that is, the gang phenomenon or third generation gangs), and to explain the linkage to insurgency. As a corollary, Dr. Max G. Manwaring argues that gang-related crime, in conjunction with the instability it wreaks upon governments, is now a serious national security and sovereignty problem in important parts of the global community. Although differences between gangs and insurgents exist, in terms of original motives and modes of operation, this linkage infers that the gang phenomenon is a mutated form of urban insurgency. That is, these nonstate actors must eventually seize political power to guarantee the freedom of action and the commercial environment they want. The common denominator that can link gangs and insurgents is that some gangs' and insurgents' ultimate objective is to depose or control the governments of targeted countries.