The Sacred Sword of the Patriots League (SSPL) (Mặt trận gươm thiêng ái quốc) was a sustained black operation that originated in the Central Intelligence Agency and was carried out by the Military Assistance Command, Vietnam – Studies and Observations Group (MACV-SOG) during the Vietnam War. It involved a combination of psychological warfare (PSYWAR) and psychological operations (PSYOP), today known as military information support operations (MISO).