Over time, the circumstances under which PEADs could be executed expanded to include events beyond nuclear warfare. One example is a 1968 FBI Memorandum from the Johnson Administration. The memorandum recommended a "Priority Apprehension Program based on dangerousness[sic] of individuals on SI" referring to the government "Security Index," and noting that the government had "recently amended [its] definition of a dangerous person in new Presidential Emergency Action Document 6, broadening it to include terrorists or persons who would interfere with Government operation and defense effort [sic]"." This Security Index contained the names of individuals whom the government considered threats and should be immediately apprehended and detained to prevent sabotage, espionage, and insurrection and contained 10,000 names. Former Carter Administration official referred to this as "The Enemies Briefcase."
https://youtu.be/QMI2AgEwyVs
Over time, the circumstances under which PEADs could be executed expanded to include events beyond nuclear warfare. One example is a 1968 FBI Memorandum from the Johnson Administration. The memorandum recommended a "Priority Apprehension Program based on dangerousness[sic] of individuals on SI" referring to the government "Security Index," and noting that the government had "recently amended [its] definition of a dangerous person in new Presidential Emergency Action Document 6, broadening it to include terrorists or persons who would interfere with Government operation and defense effort [sic]"." This Security Index contained the names of individuals whom the government considered threats and should be immediately apprehended and detained to prevent sabotage, espionage, and insurrection and contained 10,000 names. Former Carter Administration official referred to this as "The Enemies Briefcase."