The goal of this dissertation is to develop a better understanding of how militias use the internet to connect with other militias, their members, and the public. The modern militia movement in the United States experienced a resurgence of late following a rapid decline in the early 2000s. Along with the drop in membership, the interest levels of researchers and law enforcement began to fade and as a result, a significant gap formed in the literature as it relates to our understanding of the groups’ activities. I address this gap by examining the online activities of the modern militia movement at three levels. Specifically, I examine how militias throughout the United States connect with each other through their official websites, how militias operating at different geographic levels connect with other websites, and how a regional militia uses Facebook to communicate with its members and the public. The three components of this dissertation reveal that the modern militia movement has experienced important changes in its online activity since 2013. Component I examines the breakdown in the nationwide network of militia websites that occurred between 2014 and 2017. Component II reveals the ways the networks surrounding three militia groups changed from 2013 to 2017 and the important role ideology plays in the connections between websites. Component III examines the ways one militia utilized Facebook during an eleven month period, including which content posted by the group had the highest likelihood of generating participation from visitors and the interactions that occurred in the most active discussions among visitors. Understanding how militias connect with each other and with individuals is an important step towards understanding the modern movement, its goals, and activities. A deeper understanding of these groups and their activities will provide a foundation for future research and assist law enforcement developing response strategies.