Radical violent extremism is a growing concern for the Nordic countries. In this interest, we examine how traditional criminological theories can help to explain the difference between violent and non-violent radical extremist individuals. We analyse the Profiles of Individuals Radicalized in the United States (PIRUS) dataset, with information on 2148 radical criminals in the United States, using a logistic regression, wherein violence was the dependent variable. The independent variables corresponded to aspects of social bonds and social learning. Results indicate that social bond theory has little predictive value for violence among radical criminals. Social learning perspectives were somewhat more predictive, with radical peers having a significant positive effect on the likelihood of radical violence. Socio-economic status, ideology and criminal history had significant positive effects as well. We conclude by exploring theoretical explanations, further research implications and discuss a Nordic version of a database.