This Secret Service Exceptional Case Study Project "Preventing Assassination" has five parts-- a monograph, literature review, selective bibliography, summary of findings, and final activities report. From the Document: "The primary goal of the Exceptional Case Study Project was to gather information and develop knowledge that might aid law enforcement organizations to fulfill protective responsibilities for public officials and public figures. [...] The Secret Service Exceptional Case Study Project was developed to generate knowledge useful to both physical protection and protective intelligence functions. [...] It was hoped that thorough examination of the ideas, behaviors, and activities of persons who have attempted assassination (or come close to attacking) would provide and additional - and heretofore unavailable - perspective on physical protection: namely, how the assailant viewed the attack. [...] Knowledge from a study of attackers and near-assailants may also be useful in the identification, assessment, and management of persons who pose a risk of violence to public officials and public figures."
National Criminal Justice Reference Service: https://www.ncjrs.gov/