Terrorism is a global security concern that dominates the theatre of intellectual discourse in the contemporary world. This chapter is taking the case of one of the deadliest insurgents and a terrorist group in the history of Nigeria and also examined various sources of finances of this group in detail. From radical preaching, this group transformed into a terrorist group attacking security, innocent citizens, and all and sundry. As a qualitative study, the social conflict model is adopted in explaining the framework of the existing literature. The data obtained was analyzed critically using content analysis. The study discovered that insurgents sourced their finances through internal and external sources, legal and illegal engagements. The study recommends among several others that the Nigerian Government and security operatives should intensify the process of identifying, tracing, and blockage of the sources of finances for terrorism.