404 - A declassified World War II-era government guide to “simple sabotage” is currently one of the most popular open source books on the internet.
https://www.404media.co/declassified-cia-guide-to-sabotaging-fascism-is-suddenly-viral/
https://www.404media.co/declassified-cia-guide-to-sabotaging-fascism-is-suddenly-viral/
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Purchase only the basic essentials for the 4 years.
https://commons.wikimedia.org/wiki/File:Homeland_Security,_Simple_Sabotage_Field_Manual.pdf