This work seeks to remove the empirical veil associated with immigration and public insecurity by assessing the implementation of the judicial history as a measure adopted by the Lucio Gutiérrez government (2004) to the entry of Colombian citizens into Ecuador from the national perception that linked their presence in the country to the high crime rates. The analysis contains a historical and conceptual approach to international immigration and its insertion into the national scene in which myths and stereotypes around it are built. It addresses the issue of criminal populism, the doctrine of which incorporates a current inspection into the aspirations of criminal reform in Ecuador. Finally, the quantitative results of the applicability and effectiveness of the judicial past are presented.