This chapter focuses on ways in which the police deal with more serious problems, specifically terrorism and organized crime. On first examination, there appear obvious differences between the genres. Whilst terrorism is politically motivated and aims to bring social change using extreme violence against people, locations and events (Hoffman, 2006), the fundamental aim of organized crime is to achieve personal profit. However, on closer inspection some overlap is apparent. Organized crime offenders may engage with terrorists if it adds to the profitability of their actions, whilst terrorists will reciprocate if the liaison either assists their activity or provides them with the necessary illegal goods or services to facilitate their actions. Further, as terrorists and organized crime offenders are sophisticated conscious opponents, and often transnational in nature, they also share operational characteristics, meaning that the law enforcement approach to tackling these crimes also share similarities.