Decreasing state sponsorship for terrorism in the post-9/11 environment has pressed terrorist groups to find alternative sources of financial support. Some groups have created their own “in-house” criminal capabilities, for example FARC, the LTTE, and Al Qaeda. Several analysts have argued that this “mutation” in organizational form may lead terrorist groups to ally with organized crime, whereas others have suggested that distinct organizational and ideological differences between the two will preclude cooperation. Drawing on both accounts, it is argued in this article that the degree of a terrorist group's organizational capacity and need are key predictors of the types of crime they will engage in, while ideological (political) distinctiveness will preclude fully symbiotic cooperation between terrorists and organized crime groups.