The techniques employed will vary depending on whether or not the assassin himself is to be killed with the subject. If the assassin is to die with the subject, the act will be called “lost.” If the assassin is to escape, the act will be called “safe.” It should be noted that no compromise should exist here. The assassin must not fall alive into enemy hands.
Assassination techniques will also be affected by the subject’s vulnerability. Assassinations in which the subject is unaware of his danger will be termed “simple”; those in which the subject is aware but unguarded will be termed “chase;” those in which the victim is aware but guarded will be termed “guarded.”
A further division concerns whether or not it is necessary to conceal the fact that the subject was actually the victim of assassination. If such concealment is desirable, the act will be called “secret;” if concealment is immaterial, the act will be called “open.” If the assassination requires publicity to be effective, it will be termed “terroristic.”
Following these definitions, the assassination of Julius Caesar was safe, simple, and terroristic, while that of Huey Long was lost, guarded, and open. Obviously, successful secret assassinations are not recorded as assassinations at all.
Excerpt from A Study of Assasinations, 1954 The Central Intelligence Agency