Geography Speaker Series Presents, Dr. Clio Andris: Spatial Social Network Analysis: A Story of the American Mafia in the 1960s

September 21, 2020
Friday, November 20, 2020 - 3:30pm to 5:00pm
via Zoom
Geography Speaker Series, Clio Andris

Clio Andris

Assitant Professor

Georgia Tech


PDF icon Clio Andris_112020.pdf


We explore a spatial social network (SSN) of the American Mafia in the 1960s using GIS and social network analysis. We find that the network has bi-coastal ties within families and strangers who lived on the same block. We also uncover a strategic mixture of family members in open cities like Miami, and especially South Beach, likely sent to facilitate supply chain management for gambling, and drug, alcohol, cigars, etc. imports from Cuba. We identify high-degree individuals' tendency to live near the center of their respective families, as well as near docks and waterways, ostensibly to oversee overseas trade of olives, cheese, and other goods from Italy. Per the security-efficiency tradeoff theory and characteristics of small-world networks, we find that family-based ties acted more efficiently than non-family based ties, indicating some evidence of top-down organization. We also advance methodologies for spatial social networks (SSNs) in general. These include cluster/cluster matrix, network hotspot analysis, flattening ratio, route factor diagram, and general GIS spatial join and point pattern analysis methods.

Register for this webinar HERE