Central Actor Identification of Crime Group using Semantic Social Network Analysis

The Police as law enforcers who authorize in terms of social protection are expected to do both the prevention and investigation efforts also the settlement of criminal cases that occurred in the society. This research can help police to identify the main actor faster and leads to solving crime-cases. The use of overall centrality is very helpful in determining the main actors from other centrality measures. The purpose of this research is to identify the central actor of crimes done by several people. Semantic Social Network Analysis is used to perform central actor identification using five centrality measurements, such as degree centrality, betweenness centrality, closeness centrality, eigenvector centrality, and overall centrality. As for the relationship between actors, this research used social relation such as friendship, colleague, family, date or lover, and acquaintances. The relationship between actors is measured by first four centrality measures then accumulated by overall centrality to determine the main actor. The result showed 80.39% accuracy from 102 criminal cases collected with at least 3 actors involved in each case

Redes criminosas em investigações previdenciárias na Polícia Federal

Dissertação (mestrado)—Universidade de Brasília, Faculdade de Economia, Administração, Contabilidade e Gestão de Políticas Públicas, Programa de Pós-Graduação em Administração, Mestrado Profissional em Administração Pública, 2020.As fraudes contra o sistema previdenciário brasileiro causam prejuízo bilionário anualmente aos cofres públicos e o presente trabalho busca formas de auxiliar à Polícia Federal no combate a este tipo de fraude. Para tanto foram estudados, com o método da Análise de Redes Sociais, alguns casos já concluídos de operações de combate a grupos criminosos atuantes naquela área, delineando uma rede básica de composição de grupos criminosos e propondo algoritmo de detecção ou predição destes grupos. O algoritmo foi testado em investigações em andamento em quatro unidades da federação, identificando a existência de 37 prováveis grupos criminosos organizados envolvidos em fraudes apuradas em diversas investigações feitas de maneira isolada. O algoritmo proposto pode auxiliar não só na identificação ou predição de grupos criminosos, mas também ajudar na definição, mediante critérios objetivos e com base em método científico, da aplicação dos recursos disponíveis de forma a maximizar os resultados no combate à atuação de grupos criminosos organizados.Frauds against the Brazilian social security system cause billionaire losses annually to public coffers and the present work seeks ways to assist the Federal Police in combating this type of fraud. For this purpose, some cases already concluded of operations to combat criminal groups operating in that area were studied, using the Social Network Analysis method, outlining a basic network of composition of criminal groups and proposing an algorithm for detecting or predicting these groups. The algorithm was tested in ongoing investigations in four units of the federation, identifying the existence of 37 probable organized criminal groups involved in fraud investigated in several investigations carried out in isolation. The proposed algorithm can assist not only in the identification or prediction of criminal groups, but also in the definition, using objective criteria and based on a scientific method, of the application of available resources in order to maximize the results in combating the activities of organized criminal groups