The Simple Sabotage Field Manual was originally written during World War II by the Office of Strategic Services (OSS), the agency that later became the CIA. Created as a guide to help civilians behind enemy lines disrupt enemy operations, it detailed easy, low-risk actions anyone could perform to slow productivity, spread confusion, and subtly sabotage the enemy's infrastructure. From recommending delays in meetings and promoting inefficiency, to misplacing important documents, the manual reveals surprising psychological tactics designed to weaken the enemy from within. Now declassified and publicly available, it remains a unique historical document illustrating the quiet power of everyday resistance.